CVE-2025-1013

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-1013", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2025-02-04T07:26:34.165Z", "datePublished": "2025-02-04T13:58:54.445Z", "dateUpdated": "2026-04-13T14:25:18.645Z"}, "containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "128.7", "lessThanOrEqual": "128.*", "versionType": "rpm"}, {"status": "unaffected", "version": "135", "lessThanOrEqual": "*", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "128.7", "lessThanOrEqual": "128.*", "versionType": "rpm"}, {"status": "unaffected", "version": "135", "lessThanOrEqual": "*", "versionType": "rpm"}]}], "descriptions": [{"lang": "en", "value": "A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135."}]}], "title": "Potential opening of private browsing tabs in normal browsing windows", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1932555"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-07/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-09/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-10/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-11/"}], "credits": [{"lang": "en", "value": "Maruf Bin Murtuza"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-13T14:25:18.645Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-362", "lang": "en", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2025-02-04T21:11:49.089593Z", "id": "CVE-2025-1013", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-04T21:12:39.606Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:56:55.953Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:56:55.953Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-1013", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-02-04T21:11:49.089593Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-04T21:12:26.026Z"}}], "cna": {"title": "Potential opening of private browsing tabs in normal browsing windows", "credits": [{"lang": "en", "value": "Maruf Bin Murtuza"}], "affected": [{"vendor": "Mozilla", "product": "Firefox", "versions": [{"status": "unaffected", "version": "128.7", "versionType": "rpm", "lessThanOrEqual": "128.*"}, {"status": "unaffected", "version": "135", "versionType": "rpm", "lessThanOrEqual": "*"}]}, {"vendor": "Mozilla", "product": "Thunderbird", "versions": [{"status": "unaffected", "version": "128.7", "versionType": "rpm", "lessThanOrEqual": "128.*"}, {"status": "unaffected", "version": "135", "versionType": "rpm", "lessThanOrEqual": "*"}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1932555"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-07/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-09/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-10/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-11/"}], "descriptions": [{"lang": "en", "value": "A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.", "supportingMedia": [{"type": "text/html", "value": "A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.", "base64": false}]}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-13T14:25:18.645Z"}}}, "cveMetadata": {"cveId": "CVE-2025-1013", "state": "PUBLISHED", "dateUpdated": "2026-04-13T14:25:18.645Z", "dateReserved": "2025-02-04T07:26:34.165Z", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "datePublished": "2025-02-04T13:58:54.445Z", "assignerShortName": "mozilla"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "128.*", "status": "unaffected", "version": "128.7", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "135", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "128.*", "status": "unaffected", "version": "128.7", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "135", "versionType": "rpm"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "matchCriteriaId": "B1B11C09-3033-44F5-ACC7-591196075CB1", "versionEndExcluding": "128.7.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "matchCriteriaId": "BADF1FB6-FA36-4AD1-B176-0DD893E0CD9A", "versionEndExcluding": "135.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "1E4B98F4-AC9B-402A-B7D2-829373BFBD66", "versionEndExcluding": "128.7.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "5E83B28A-FF6A-4C0A-B5BD-1CE5DEC24C64", "versionEndExcluding": "135.0", "versionStartIncluding": "129.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135."}, {"lang": "es", "value": "Una condici\u00f3n ejecuci\u00f3n podr\u00eda haber provocado que se abrieran pesta\u00f1as de navegaci\u00f3n privada en ventanas de navegaci\u00f3n normales. Esto podr\u00eda haber provocado una posible fuga de privacidad. Esta vulnerabilidad afecta a Firefox menor que 135, Firefox ESR menor que 128.7, Thunderbird menor que 128.7 y Thunderbird menor que 135."}], "id": "CVE-2025-1013", "lastModified": "2026-10-05T15:10:00.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-1013", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-02-04T21:11:49.089593Z", "version": "2.0.3"}}]}, "published": "2025-02-04T14:15:32.123", "references": [{"source": "security@mozilla.org", "tags": ["Issue Tracking"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1932555"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-07/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-09/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-10/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-11/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:1132", "cpe": "cpe:/o:redhat:rhel_els:7", "package": "firefox-0:128.7.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1283", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:128.7.0-1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-02-11T00:00:00Z"}, {"advisory": "RHSA-2025:1292", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:128.7.0-1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-02-11T00:00:00Z"}, {"advisory": "RHSA-2025:1133", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "firefox-0:128.7.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1348", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "thunderbird-0:128.7.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2025-02-12T00:00:00Z"}, {"advisory": "RHSA-2025:1135", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "firefox-0:128.7.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1339", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "thunderbird-0:128.7.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2025-02-12T00:00:00Z"}, {"advisory": "RHSA-2025:1135", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "firefox-0:128.7.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1339", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "thunderbird-0:128.7.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2025-02-12T00:00:00Z"}, {"advisory": "RHSA-2025:1135", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "firefox-0:128.7.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1339", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "thunderbird-0:128.7.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2025-02-12T00:00:00Z"}, {"advisory": "RHSA-2025:1136", "cpe": "cpe:/a:redhat:rhel_aus:8.6", "package": "firefox-0:128.7.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1341", "cpe": "cpe:/a:redhat:rhel_aus:8.6", "package": "thunderbird-0:128.7.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2025-02-12T00:00:00Z"}, {"advisory": "RHSA-2025:1136", "cpe": "cpe:/a:redhat:rhel_tus:8.6", "package": "firefox-0:128.7.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1341", "cpe": "cpe:/a:redhat:rhel_tus:8.6", "package": "thunderbird-0:128.7.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2025-02-12T00:00:00Z"}, {"advisory": "RHSA-2025:1136", "cpe": "cpe:/a:redhat:rhel_e4s:8.6", "package": "firefox-0:128.7.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1341", "cpe": "cpe:/a:redhat:rhel_e4s:8.6", "package": "thunderbird-0:128.7.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2025-02-12T00:00:00Z"}, {"advisory": "RHSA-2025:1137", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "firefox-0:128.7.0-1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1340", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "thunderbird-0:128.7.0-1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2025-02-12T00:00:00Z"}, {"advisory": "RHSA-2025:1066", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "firefox-0:128.7.0-1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-02-05T00:00:00Z"}, {"advisory": "RHSA-2025:1184", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "thunderbird-0:128.7.0-1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-02-10T00:00:00Z"}, {"advisory": "RHSA-2025:1138", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "firefox-0:128.7.0-1.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1319", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "thunderbird-0:128.7.0-1.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2025-02-11T00:00:00Z"}, {"advisory": "RHSA-2025:1139", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "firefox-0:128.7.0-1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1317", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "thunderbird-0:128.7.0-1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2025-02-11T00:00:00Z"}, {"advisory": "RHSA-2025:1140", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "firefox-0:128.7.0-1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-02-06T00:00:00Z"}, {"advisory": "RHSA-2025:1318", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "thunderbird-0:128.7.0-1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-02-11T00:00:00Z"}], "bugzilla": {"description": "firefox: thunderbird: Potential opening of private browsing tabs in normal browsing windows", "id": "2343754", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2343754"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "status": "verified"}, "cwe": "CWE-362", "details": ["A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability affects Firefox < 135, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135."], "name": "CVE-2025-1013", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird-flatpak-container", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird-flatpak-container", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-04T13:58:54Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-1013\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-1013\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=1932555\nhttps://www.mozilla.org/security/advisories/mfsa2025-07/\nhttps://www.mozilla.org/security/advisories/mfsa2025-09/\nhttps://www.mozilla.org/security/advisories/mfsa2025-10/\nhttps://www.mozilla.org/security/advisories/mfsa2025-11/"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-20T18:29:11.805236+00:00", "value": {"mitigation_remediation": ["Upgrade Mozilla Firefox to version\u202f135 or later, or to Firefox\u202fESR\u202f128.7 or later if using an extended\u2011support release. ", "Upgrade Mozilla Thunderbird to version\u202f135 or later, or to Thunderbird\u202fESR\u202f128.7 or later if using an extended\u2011support release. ", "If an immediate update is not feasible, ensure that all X86_64 Red\u202fHat Enterprise Linux package repositories are regularly checked for updated package lists that contain the latest browser versions, and apply those updates as soon as they are available."], "summary": {"action": "Apply Patch", "impact": "Potential privacy leakage through unintended display of private browsing data in normal windows"}, "threat_synthesis": {"affected_systems": "The flaw affects Mozilla Firefox and Mozilla Thunderbird browsers. Versions prior to Firefox\u00a0135 and Firefox\u00a0ESR\u00a0128.7, and Thunderbird prior to Thunderbird\u00a0135 and Thunderbird\u00a0ESR\u00a0128.7 are vulnerable. Red Hat Enterprise Linux packages that embed these browser components may also be affected if the bundled versions are out of date.", "description_and_impact": "A race condition in the browser\u2019s handling of tab contexts can allow private browsing tabs to open inside a standard browsing window, exposing users\u2019 confidential information. This flaw provides an unauthorized view into private content, constituting a privacy leak. The weakness falls under CWE\u2011362, indicating a timing flaw between concurrent operations.", "risk_and_exploitability": "The CVSS score of 6.5 classifies the vulnerability as moderate. An EPSS score of less than 1% suggests a very low probability of exploitation in the wild, and the flaw is not currently listed in the CISA KEV catalog. The likely attack vector is local, requiring the attacker to have access to a user session or the browser process to trigger the race condition. Because the flaw depends on user activity and precise timing, the likelihood of successful exploitation remains low, but it should not be ignored because of the potential privacy impact."}}}}, "created": "2026-04-20T18:30:13.983744+00:00", "updated": "2026-04-20T18:30:13.983759+00:00", "vendors": []}