CVE-2026-4688

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{"bugzilla": {"description": "firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component", "id": "2450713", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450713"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nSandbox escape due to use-after-free in the Disability Access APIs component"], "name": "CVE-2026-4688", "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:10", "fix_state": "Affected", "package_name": "rhel10/thunderbird-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird", "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:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "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:7", "fix_state": "Out of support scope", "package_name": "thunderbird", "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:8", "fix_state": "Affected", "package_name": "thunderbird", "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"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-24T12:30:22Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4688\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4688\nhttps://www.mozilla.org/security/advisories/mfsa2026-22/#CVE-2026-4688\nhttps://www.mozilla.org/security/advisories/mfsa2026-24/#CVE-2026-4688"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,149)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,140.9)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox ESR", "source": "cna", "vendor": "Mozilla"}, "product": "firefox_esr", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-04-13T16:21:44.855796+00:00", "value": {"mitigation_remediation": ["Apply the latest Firefox update (version\u202f149 or newer)", "Apply the latest Thunderbird update (version\u202f149 or newer)", "For users on the ESR line, install the ESR\u202f140.9 update or newer", "If upgrading is delayed, restrict access to potentially dangerous content through browser security settings or content security policy"], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox and Mozilla Thunderbird are affected. Versions prior to Firefox\u202f149 and Thunderbird\u202f149, including the extended support releases Firefox\u202fESR\u202f140.9 and Thunderbird\u202fESR\u202f140.9, contain the bug; subsequent releases contain the fix.", "description_and_impact": "A use\u2011after\u2011free flaw in the Disability Access APIs component enables a sandbox escape, allowing attackers to cause the browser or mail client to execute code that it normally would not be permitted to run. The vulnerability corresponds to the Use After Free weakness (CWE\u2011416) and involves improper handling of certain memory resources (CWE\u2011825).", "risk_and_exploitability": "The CVSS score of 9.6 indicates a high\u2011severity risk, yet the EPSS score of less than 1\u202f% suggests that exploitation is currently unlikely and the vulnerability is not listed in the CISA KEV catalog. Based on the CVE description, it is inferred that an attacker would need to supply malicious sandboxed content\u2014such as a crafted web page or document\u2014to trigger the use\u2011after\u2011free; if successful, the attacker could achieve full process compromise. The attack vector is inferred to be via privileged sandboxed content rather than a direct remote network exploit."}}}}, "created": "2026-03-25T11:48:20.469268+00:00", "updated": "2026-04-14T16:43:42.299749+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr"]}