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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "matchCriteriaId": "15AF037C-5C86-48EB-B1DE-3AC100A34596", "versionEndExcluding": "140.10.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "matchCriteriaId": "67B01D49-66FA-4C76-9EB4-2B8CD61FBEB2", "versionEndExcluding": "150.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*", "matchCriteriaId": "48217E2F-FFD3-4385-B962-15365B293DA7", "versionEndExcluding": "140.10.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."}], "id": "CVE-2026-6761", "lastModified": "2026-04-22T14:56:13.180", "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": "2026-04-21T13:16:22.040", "references": [{"source": "security@mozilla.org", "tags": ["Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2017857"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-32/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-33/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2026-34/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-269"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "firefox: Privilege escalation in the Networking component", "id": "2460099", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460099"}, "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"}, "cwe": "CWE-266", "details": ["A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:\nPrivilege escalation in the Networking component"], "name": "CVE-2026-6761", "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": "2026-04-21T12:40:56Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-6761\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6761\nhttps://www.mozilla.org/security/advisories/mfsa2026-30/#CVE-2026-6761\nhttps://www.mozilla.org/security/advisories/mfsa2026-32/#CVE-2026-6761"], "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": "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": "2026-04-22T19:43:26.259172+00:00", "value": {"mitigation_remediation": ["Upgrade Mozilla Firefox to version 150 or newer, or to Firefox ESR 140.10 or newer, and upgrade Mozilla Thunderbird to version 150 or newer, or to Thunderbird ESR 140.10 or newer, to obtain the vendor\u2011issued fix.", "If a system upgrade cannot be performed immediately, reduce exposure by limiting network traffic that the affected machine receives, and restrict untrusted connections.", "Until the update is applied, consider disabling or restricting the Networking component through policy or local configuration to block the vulnerability's attack surface."], "summary": {"action": "Patch", "impact": "Privilege Escalation"}, "threat_synthesis": {"affected_systems": "Affected systems include all installations of Mozilla Firefox older than version 150 or the ESR 140.10 release, as well as all Mozilla Thunderbird releases earlier than version 150 or the 140.10 ESR release. These pre\u2011fix versions are vulnerable because the exploit code remains present in their Networking components.", "description_and_impact": "This vulnerability lies in the Networking component of Mozilla Firefox and Thunderbird, allowing a malicious actor to gain higher privileges on the affected host system. The flaw represents a weakness in permissions and privilege management (CWE-266) and can lead to escalation of privileges (CWE-269). The result is that an attacker can perform actions normally restricted to privileged users, potentially compromising data integrity and confidentiality on the host.", "risk_and_exploitability": "The CVSS score of 8.8 signals high severity. The EPSS score is less than 1%, indicating that while exploitation potential is low, the impact of a successful attack is significant. The vulnerability is not listed in the CISA KEV catalog, suggesting no publicly known active exploitation at the time of this analysis. The attack vector is not explicitly described, but given that the problem resides within a networking component, it is inferred that the flaw could be triggered via malicious network traffic or local requests that abuse the component."}}}}, "created": "2026-04-21T16:45:15.076867+00:00", "updated": "2026-04-22T19:45:25.287258+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"]}