{"id":"CVE-2026-124903","published":"2026-11-10T14:17:23.990","lastModified":"2026-11-10T21:19:16.820","description":"Sandbox escape due to use-after-free in the IPC component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.","cvssScore":9.6,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","cwes":["CWE-416"],"vendors":[],"products":[],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2084673","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-125/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-126/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-127/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-128/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-129/","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A use-after-free vulnerability in Firefox and Thunderbird's IPC component allows an attacker to escape the sandbox after tricking a user into visiting a malicious site, leading to arbitrary code execution with the privileges of the compromised process.","exploitability":"Exploitation requires user interaction (e.g., visiting a crafted webpage) and reliable exploitation is non-trivial due to memory safety mitigations, though the high CVSS score suggests successful public or near-public proof-of-concept likely exists.","blast_radius":"Successful exploitation could lead to full system compromise via sandbox escape, enabling attackers to steal sensitive data, install malware, or pivot laterally within the user's environment.","remediation":"Upgrade Firefox to version 160 or later, Firefox ESR to 115.45 or 153.7, or Thunderbird to version 160 or 153.7 as appropriate.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["sandbox-escape","use-after-free","ipc","firefox","thunderbird"],"model":"garnet-coder","analyzedAt":"2026-11-11T09:54:55.292Z"}}