CVE-2026-2784

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-2784", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2026-02-19T15:06:19.739Z", "datePublished": "2026-02-24T13:33:17.554Z", "dateUpdated": "2026-04-16T14:32:57.551Z"}, "containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "140.8", "lessThanOrEqual": "140.*", "versionType": "rpm"}, {"status": "unaffected", "version": "148", "lessThanOrEqual": "*", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "140.8", "lessThanOrEqual": "140.*", "versionType": "rpm"}, {"status": "unaffected", "version": "148", "lessThanOrEqual": "*", "versionType": "rpm"}]}], "descriptions": [{"lang": "en", "value": "Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8."}]}], "title": "Mitigation bypass in the DOM: Security component", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2012984"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-13/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-15/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-16/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-17/"}], "credits": [{"lang": "en", "value": "D. Santos"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-13T13:53:34.499Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-288", "lang": "en", "description": "CWE-288 Authentication Bypass Using an Alternate Path or Channel"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-02-28T03:13:23.268966Z", "id": "CVE-2026-2784", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-16T14:32:57.551Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-2784", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-02-28T03:13:23.268966Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-288", "description": "CWE-288 Authentication Bypass Using an Alternate Path or Channel"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-28T03:13:43.105Z"}}], "cna": {"title": "Mitigation bypass in the DOM: Security component", "credits": [{"lang": "en", "value": "D. Santos"}], "affected": [{"vendor": "Mozilla", "product": "Firefox", "versions": [{"status": "unaffected", "version": "140.8", "versionType": "rpm", "lessThanOrEqual": "140.*"}, {"status": "unaffected", "version": "148", "versionType": "rpm", "lessThanOrEqual": "*"}]}, {"vendor": "Mozilla", "product": "Thunderbird", "versions": [{"status": "unaffected", "version": "140.8", "versionType": "rpm", "lessThanOrEqual": "140.*"}, {"status": "unaffected", "version": "148", "versionType": "rpm", "lessThanOrEqual": "*"}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2012984"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-13/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-15/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-16/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-17/"}], "descriptions": [{"lang": "en", "value": "Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.", "supportingMedia": [{"type": "text/html", "value": "Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.", "base64": false}]}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-13T13:53:34.499Z"}}}, "cveMetadata": {"cveId": "CVE-2026-2784", "state": "PUBLISHED", "dateUpdated": "2026-04-16T14:32:57.551Z", "dateReserved": "2026-02-19T15:06:19.739Z", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "datePublished": "2026-02-24T13:33:17.554Z", "assignerShortName": "mozilla"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "140.*", "status": "unaffected", "version": "140.8", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "148", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "140.*", "status": "unaffected", "version": "140.8", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "148", "versionType": "rpm"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "matchCriteriaId": "7DA5BF3D-3278-43DD-9DD4-C78D7A2C1883", "versionEndExcluding": "140.8.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "matchCriteriaId": "3D8676DB-4A12-41A0-A1A5-2DED97287973", "versionEndExcluding": "148.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*", "matchCriteriaId": "73228A3D-A71B-497B-A5BA-412FFE9F6F37", "versionEndExcluding": "140.8.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*", "matchCriteriaId": "C5EBE90D-1996-4578-B715-605B24E66C59", "versionEndExcluding": "148.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8."}, {"lang": "es", "value": "Elusi\u00f3n de mitigaci\u00f3n en el DOM: Componente de seguridad. Esta vulnerabilidad afecta a Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, y Thunderbird < 140.8."}], "id": "CVE-2026-2784", "lastModified": "2026-06-17T10:31:45.430", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-2784", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-28T03:13:23.268966Z", "version": "2.0.3"}}]}, "published": "2026-02-24T14:16:26.847", "references": [{"source": "security@mozilla.org", "tags": ["Issue Tracking", "Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2012984"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-13/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-15/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-16/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-17/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-288"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "firefox: Mitigation bypass in the DOM: Security component", "id": "2442304", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442304"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-2784", "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": "rhel10/firefox-flatpak", "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:7", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-24T13:33:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-2784\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-2784\nhttps://www.mozilla.org/security/advisories/mfsa2026-15/#CVE-2026-2784"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,148)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,140.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox ESR", "source": "cna", "vendor": "Mozilla"}, "product": "firefox_esr", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,148)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Thunderbird", "source": "cna", "vendor": "Mozilla"}, "product": "thunderbird", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,140.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Thunderbird", "source": "cna", "vendor": "Mozilla"}, "product": "thunderbird", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-04-15T15:29:33.154213+00:00", "value": {"mitigation_remediation": ["Upgrade Firefox to version 148 or the ESR 140.8 release, and upgrade Thunderbird to version 148 or the ESR 140.8 release", "Remove or disable any add\u2011ons or extensions that may interact with the DOM: Security component and have not been updated to support compatible versions", "Apply vendor\u2011issued security updates promptly and monitor Mozilla advisories for related patches or additional controls"], "summary": {"action": "Patch Immediately", "impact": "Authorization bypass potentially enabling arbitrary code execution"}, "threat_synthesis": {"affected_systems": "Mozilla products are affected. The issue is fixed in Firefox 148 and the ESR 140.8 branch, as well as in Thunderbird 148 and Thunderbird 140.8. Versions older than these should be considered vulnerable until patched.", "description_and_impact": "A bypass of security controls in the DOM: Security component has been identified, rated with a CVSS score of 9.8. The vulnerability allows a malicious entity to circumvent established authorization checks, potentially enabling the execution of unauthorized code or content. This high\u2011severity weakness is classified under CWE\u2011288, indicating a failure to enforce or verify proper privileges. No explicit details are provided in the description, so the exact mechanics remain unspecified, but the impact is clear: the bypass can compromise both confidentiality and integrity of the affected applications.", "risk_and_exploitability": "The EPSS score of less than 1% suggests a low current exploitation probability, and the vulnerability is not listed in the CISA KEV catalog. Despite this, the remote impact and the severity rating call for urgent action. Attackers would need to entice a user into loading malicious content or exploit a web page that interacts with the vulnerable component; the precise attack path is not detailed, so the likely vector is inferred to involve client\u2011side DOM manipulation or crafted web content that triggers the bypass. Even with low observed exploitation, the combination of high CVSS and critical functional impact warrants immediate remediation."}}}}, "created": "2026-02-25T11:39:26.018157+00:00", "updated": "2026-04-15T17:15:10.560403+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}