{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-6750", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2026-04-21T12:40:47.165Z", "datePublished": "2026-04-21T12:40:47.476Z", "dateUpdated": "2026-04-21T23:34:41.650Z"}, "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": "Privilege escalation in the Graphics: WebRender 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": "Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."}]}], "title": "Privilege escalation in the Graphics: WebRender component", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2023407"}, {"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": "choeseyeong"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-21T23:34:41.650Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-269", "lang": "en", "description": "CWE-269 Improper Privilege Management"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-21T20:25:17.806617Z", "id": "CVE-2026-6750", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"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": "2026-04-21T20:25:37.841Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."}], "id": "CVE-2026-6750", "lastModified": "2026-04-22T00:16:30.583", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-04-21T13:16:21.073", "references": [{"source": "security@mozilla.org", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2023407"}, {"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", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-269"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"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": "2026-04-22T05:47:22.699643+00:00", "value": {"mitigation_remediation": ["Upgrade Firefox to 150 or newer ESR releases (115.35 or 140.10) and upgrade Thunderbird to 150 or newer ESR releases (115.35 or 140.10) as soon as possible", "If an immediate upgrade is not possible, disable the WebRender component via the appropriate about:config preference to restrict the privileged rendering process", "Remove or quarantine any unused older Firefox or Thunderbird binaries to prevent accidental execution of the vulnerable component"], "summary": {"action": "Apply patch", "impact": "Privilege escalation"}, "threat_synthesis": {"affected_systems": "The defect is present in all Mozilla Firefox releases earlier than version 150 and in all ESR releases prior to 115.35 and 140.10. It also affects Thunderbird versions older than 150 and ESR releases prior to the same 115.35 and 140.10 releases. Users who run those older binaries are susceptible until they upgrade to the patched versions.", "description_and_impact": "A flaw in the Graphics: WebRender component allows malicious content to bypass the normal privilege boundary between the rendering process and the rest of the browser, enabling an attacker to execute code with higher privileges than the user who runs Firefox or Thunderbird. The vulnerability is a CWE-269 flaw, where improper privilege management allows the escalation. If successfully exploited, the attacker can compromise both the integrity and confidentiality of the affected system and gain a foothold for further compromise.", "risk_and_exploitability": "The CVSS score of 8.8 indicates a high severity. The EPSS score is not available, suggesting that the exploit probability has not been quantified; however, the absence of a KEV listing means it is not known to be actively exploited by known threat actors. The likely attack vector involves the delivery of malicious content to the WebRender component through a web page or a local file, a scenario inferred from the nature of the component."}}}}, "created": "2026-04-21T17:00:11.951845+00:00", "updated": "2026-04-22T06:00:09.651366+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"]}