{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-6762", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2026-04-21T12:40:56.529Z", "datePublished": "2026-04-21T12:40:56.838Z", "dateUpdated": "2026-04-21T23:34:54.884Z"}, "containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "115.35", "lessThanOrEqual": "115.*", "versionType": "rpm"}, {"status": "unaffected", "version": "140.10", "lessThanOrEqual": "140.*", "versionType": "rpm"}, {"status": "unaffected", "version": "150", "lessThanOrEqual": "*", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "140.10", "lessThanOrEqual": "140.*", "versionType": "rpm"}, {"status": "unaffected", "version": "150", "lessThanOrEqual": "*", "versionType": "rpm"}]}], "descriptions": [{"lang": "en", "value": "Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."}]}], "title": "Spoofing issue in the DOM: Core & HTML component", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2021080"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-31/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-32/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-33/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-34/"}], "credits": [{"lang": "en", "value": "Farras Givari"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-21T23:34:54.884Z"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."}], "id": "CVE-2026-6762", "lastModified": "2026-04-22T00:16:32.323", "metrics": {}, "published": "2026-04-21T13:16:22.137", "references": [{"source": "security@mozilla.org", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2021080"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-31/"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-32/"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-33/"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-34/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Undergoing Analysis"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[115.35,115.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[140.10,140.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[150,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-04-22T10:08:37.101435+00:00", "value": {"mitigation_remediation": ["Upgrade Mozilla Firefox to at least version 150, or to Firefox ESR 115.35 or ESR 140.10", "Upgrade Mozilla Thunderbird to at least version 150, or to Thunderbird ESR 140.10", "Run browsers in safe mode to verify the issue is resolved and to disable extensions that could manipulate the DOM", "Enable built\u2011in script blocking or enforce a stricter Content Security Policy to limit malicious DOM modifications if an immediate upgrade is not possible"], "summary": {"action": "Immediate Patch", "impact": "User Interface Spoofing"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox versions before 150 and Mozilla Thunderbird versions before 150 are vulnerable. Firefox ESR 115.35, Firefox ESR 140.10, and Thunderbird ESR 140.10 contain the fix and are not affected. Systems running those versions are safe.", "description_and_impact": "The vulnerability is a DOM: Core & HTML component spoofing flaw that allows a malicious web page to forge or misrepresent DOM elements, potentially leading to user confusion, phishing, or credential theft. It manifests in both Mozilla Firefox and Thunderbird browsers. The flaw does not provide direct code execution but can damage the integrity of the user interface. It is aligned with input validation and user interface integrity weaknesses.", "risk_and_exploitability": "No EPSS score is listed, and the vulnerability is not indexed in the CISA KEV catalog, indicating no known exploitation yet. The likely attack vector involves a maliciously crafted web page that the user visits, as the flaw resides in the browser\u2019s core DOM handling. The risk for a typical organization is moderate: an attacker could deceive users but requires user interaction. Nonetheless, the lack of a public exploit reduces but does not eliminate the risk, so patching is advised."}}}}, "created": "2026-04-21T19:15:25.855935+00:00", "updated": "2026-04-22T10:15:14.511873+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"], "weaknesses": ["CWE-79", "CWE-74"]}