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{"configurations": [{"nodes": [{"cpeMatch": [{"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:*:*:*:*:-:*:*:*", "matchCriteriaId": "5DDDA58D-2B1E-4956-9CC2-45B3017F3F0B", "versionEndExcluding": "150.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150."}], "id": "CVE-2026-6760", "lastModified": "2026-04-22T17:38:48.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-04-21T13:16:21.950", "references": [{"source": "security@mozilla.org", "tags": ["Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2016923"}, {"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/mfsa2026-33/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-288"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "firefox: Mitigation bypass in the Networking: Cookies component", "id": "2460080", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460080"}, "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-807", "details": ["A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:\nMitigation bypass in the Networking: Cookies component"], "name": "CVE-2026-6760", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "rhel10/firefox-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-21T12:40:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-6760\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6760\nhttps://www.mozilla.org/security/advisories/mfsa2026-30/#CVE-2026-6760"], "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": "[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": "2026-04-28T21:30:58.521710+00:00", "value": {"mitigation_remediation": ["Upgrade Firefox and Thunderbird to version 150 or later to apply the fixed checks for cookie mitigation, addressing CWE\u2011288.", "Disable or remove extensions that modify cookie handling behavior, mitigating CWE\u2011807 exploitation of untrusted input.", "Enforce stricter cookie policies, ensuring cookies have Secure and SameSite attributes and disabling third\u2011party cookies to reduce potential bypass vectors."], "summary": {"action": "Immediate Patch", "impact": "Cookie Mitigation Bypass"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox and Mozilla Thunderbird installations using any version before 150 are vulnerable; the fix was introduced in Firefox 150 and Thunderbird 150.", "description_and_impact": "This vulnerability allows an attacker to bypass the cookie mitigation checks implemented by the Networking: Cookies component, enabling the setting or reading of cookies that should otherwise be prohibited.", "risk_and_exploitability": "The CVSS score of 9.8 indicates critical severity, while the EPSS score of less than 1% suggests a low probability of exploitation. It is not listed in CISA KEV. Based on the description, it is inferred that exploitation requires malicious content that triggers the cookie handling logic, such as crafted HTTP requests or malicious web pages injected into the browser or email client."}}}}, "created": "2026-04-21T16:45:15.077210+00:00", "updated": "2026-04-28T21:45:26.131498+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"]}