CVE-2020-26956

{"containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 83"}]}, {"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.5"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.5"}]}], "descriptions": [{"lang": "en", "value": "In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5."}], "problemTypes": [{"descriptions": [{"description": "XSS through paste (manual and clipboard API)", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2020-12-09T00:21:39.000Z", "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1666300"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-50/"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-52/"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-51/"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@mozilla.org", "ID": "CVE-2020-26956", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Firefox", "version": {"version_data": [{"version_value": "< 83"}]}}, {"product_name": "Firefox ESR", "version": {"version_data": [{"version_value": "< 78.5"}]}}, {"product_name": "Thunderbird", "version": {"version_data": [{"version_value": "< 78.5"}]}}]}, "vendor_name": "Mozilla"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "XSS through paste (manual and clipboard API)"}]}]}, "references": {"reference_data": [{"name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1666300", "refsource": "MISC", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1666300"}, {"name": "https://www.mozilla.org/security/advisories/mfsa2020-50/", "refsource": "CONFIRM", "url": "https://www.mozilla.org/security/advisories/mfsa2020-50/"}, {"name": "https://www.mozilla.org/security/advisories/mfsa2020-52/", "refsource": "CONFIRM", "url": "https://www.mozilla.org/security/advisories/mfsa2020-52/"}, {"name": "https://www.mozilla.org/security/advisories/mfsa2020-51/", "refsource": "CONFIRM", "url": "https://www.mozilla.org/security/advisories/mfsa2020-51/"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T16:03:23.066Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1666300"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-50/"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-52/"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-51/"}]}]}, "cveMetadata": {"assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "assignerShortName": "mozilla", "cveId": "CVE-2020-26956", "datePublished": "2020-12-09T00:21:39.000Z", "dateReserved": "2020-10-12T00:00:00.000Z", "dateUpdated": "2024-08-04T16:03:23.066Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 83"}]}, {"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.5"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.5"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "matchCriteriaId": "9385C808-43DD-4D02-B1A9-89A2E3986DF2", "versionEndExcluding": "83.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*", "matchCriteriaId": "36160ED9-05B8-4E38-8C67-49EE1738AF8B", "versionEndExcluding": "78.5", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "C169EC17-3490-437D-A36B-40C3DE316175", "versionEndExcluding": "78.5", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5."}, {"lang": "es", "value": "En algunos casos, al eliminar unos elementos HTML durante el saneamiento mantendr\u00eda los actuales manejadores de eventos SVG y, por lo tanto, conllevar\u00eda a un ataque de tipo XSS. Esta vulnerabilidad afecta a Firefox versiones anteriores a 83, Firefox ESR versiones anteriores a 78.5, y Thunderbird versiones anteriores a 78.5"}], "id": "CVE-2020-26956", "lastModified": "2026-06-17T03:08:36.903", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-12-09T01:15:12.957", "references": [{"source": "security@mozilla.org", "tags": ["Issue Tracking", "Permissions Required", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1666300"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-50/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-51/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-52/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Permissions Required", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1666300"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-50/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-51/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-52/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Irvan Kurniawan (@sourc7) as the original reporter.", "affected_release": [{"advisory": "RHSA-2020:5238", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "thunderbird-0:78.5.0-1.el6_10", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5257", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "firefox-0:78.5.0-1.el6_10", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5235", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "thunderbird-0:78.5.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5239", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "firefox-0:78.5.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5236", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:78.5.0-1.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5237", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:78.5.0-1.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5240", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "thunderbird-0:78.5.0-1.el8_0", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5314", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "firefox-0:78.5.0-1.el8_0", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-12-01T00:00:00Z"}, {"advisory": "RHSA-2020:5231", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "thunderbird-0:78.5.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5233", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "firefox-0:78.5.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5232", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "thunderbird-0:78.5.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5234", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "firefox-0:78.5.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2020-11-30T00:00:00Z"}], "bugzilla": {"description": "Mozilla: XSS through paste (manual and clipboard API)", "id": "1898734", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1898734"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "verified"}, "cwe": "CWE-79", "details": ["In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5."], "name": "CVE-2020-26956", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2020-11-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-26956\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-26956\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2020-51/#CVE-2020-26956"], "threat_severity": "Moderate"}

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