{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-6761", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2026-04-21T12:40:55.759Z", "datePublished": "2026-04-21T12:40:56.138Z", "dateUpdated": "2026-04-21T23:34:53.817Z"}, "containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"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 Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."}]}], "title": "Privilege escalation in the Networking component", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2017857"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"}, {"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": "kiyong"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-21T23:34:53.817Z"}}, "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": "2026-04-21T20:24:28.558487Z", "id": "CVE-2026-6761", "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": "2026-04-21T20:24:43.560Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "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": {"id": "CVE-2026-6761", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-04-21T20:24:28.558487Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-269", "description": "CWE-269 Improper Privilege Management"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-21T17:53:00.479Z"}}], "cna": {"title": "Privilege escalation in the Networking component", "credits": [{"lang": "en", "value": "kiyong"}], "affected": [{"vendor": "Mozilla", "product": "Firefox", "versions": [{"status": "unaffected", "version": "140.10", "versionType": "rpm", "lessThanOrEqual": "140.*"}, {"status": "unaffected", "version": "150", "versionType": "rpm", "lessThanOrEqual": "*"}]}, {"vendor": "Mozilla", "product": "Thunderbird", "versions": [{"status": "unaffected", "version": "140.10", "versionType": "rpm", "lessThanOrEqual": "140.*"}, {"status": "unaffected", "version": "150", "versionType": "rpm", "lessThanOrEqual": "*"}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2017857"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"}, {"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/"}], "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.", "supportingMedia": [{"type": "text/html", "value": "Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.", "base64": false}]}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-21T23:34:53.817Z"}}}, "cveMetadata": {"cveId": "CVE-2026-6761", "state": "PUBLISHED", "dateUpdated": "2026-04-21T23:34:53.817Z", "dateReserved": "2026-04-21T12:40:55.759Z", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "datePublished": "2026-04-21T12:40:56.138Z", "assignerShortName": "mozilla"}, "dataVersion": "5.2"}

{"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": "2026-04-22T06:54:56.731980+00:00", "value": {"mitigation_remediation": ["Upgrade to Firefox 150 or newer, or to Firefox ESR 140.10 or newer, and upgrade Thunderbird to 150 or ESR 140.10 or newer, to obtain the vendor\u2011issued fix.", "If an upgrade cannot be performed immediately, mitigate exposure by limiting the network traffic that the machine can receive, restricting untrusted connections to the affected system.", "Consider disabling or restricting the Networking component via policy or configuration until the update is applied to reduce the risk pathway for an attacker."], "summary": {"action": "Patch", "impact": "Privilege Escalation"}, "threat_synthesis": {"affected_systems": "All installations of Mozilla Firefox and Thunderbird running any release older than Firefox 150, Firefox ESR 140.10, Thunderbird 150, or Thunderbird ESR 140.10 are impacted. Versions 150 and later or ESR 140.10 and later of each product contain the fix, rendering those and later releases immune to this specific privilege escalation. The vulnerability affects only the Mozilla product family identified by the CNA.", "description_and_impact": "The flaw resides in the Networking component of Mozilla Firefox and Thunderbird, allowing an attacker to increase their privileges on the host system. The vulnerability is known to have been remedied in Firefox version 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird ESR 140.10, indicating that the flaw was functional and worthy of a security update.", "risk_and_exploitability": "The CVSS score is 8.8, indicating high severity, while the EPSS score is not available and the flaw is not catalogued in the CISA KEV list, so the precise likelihood of exploitation remains uncertain. The description does not specify the attack vector; it is inferred that exploitation could involve local or remote activities that target the Networking component, but this inference is only based on the component name, not on explicit documentation."}}}}, "created": "2026-04-21T16:45:15.076867+00:00", "updated": "2026-04-22T07:00:12.125074+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"]}