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false, "cvss3": {"cvss3_base_score": "8.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-94", "details": ["Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation. This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Firefox ESR < 115.23, Thunderbird < 138, and Thunderbird < 128.10.", "A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Mozilla Firefox's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation."], "name": "CVE-2025-2817", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird-flatpak-container", "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": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird-flatpak-container", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-04-29T13:13:33Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-2817\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-2817\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=1917536\nhttps://www.mozilla.org/security/advisories/mfsa2025-28/\nhttps://www.mozilla.org/security/advisories/mfsa2025-29/\nhttps://www.mozilla.org/security/advisories/mfsa2025-30/\nhttps://www.mozilla.org/security/advisories/mfsa2025-31/\nhttps://www.mozilla.org/security/advisories/mfsa2025-32/"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-20T20:35:00.359412+00:00", "value": {"mitigation_remediation": ["Update Thunderbird to 138 or later, or to 128.10 if on an ESR release.", "Update Firefox to 138 or later, or to ESR 128.10 or 115.23, per affected versions.", "Disable or restrict the SYSTEM\u2011level updater from running with elevated privileges, or temporarily disable automatic updates until the patch is applied."], "summary": {"action": "Immediate Patch", "impact": "Privilege Escalation"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Mozilla\u2019s Thunderbird and Firefox browsers. It is present in Thunderbird and Firefox releases prior to version 138, and in Firefox ESR builds before 128.10 and 115.23. System administrators running Red\u2011Hat Enterprise Linux 8, 9, and related extended\u2011support releases are potentially impacted when the updater runs as SYSTEM. All environments where the updater is enabled on an affected client should be examined.", "description_and_impact": "Thunderbird\u2019s updater contains a flaw that lets a local user process with medium integrity inject code to interfere with the SYSTEM\u2011level update mechanism. By manipulating file\u2011locking, the attacker can bypass access controls and perform SYSTEM\u2011level file operations on paths that are normally controlled by a non\u2011privileged user. This fault is categorized under CWE\u201122 (Path Traversal) and CWE\u201194 (Code Injection), allowing the malicious actor to gain higher privileges on the machine.", "risk_and_exploitability": "The CVSS score of 8.8 reflects a high severity due to the potential for privilege escalation. The EPSS score is below 1%, indicating that exploitation is currently considered unlikely, and the vulnerability is not listed in the CISA KEV catalog. The likely attack path requires local, medium\u2011integrity access\u2014typically the ability to run code as a logged\u2011in user. An attacker could then trigger the updater to execute SYSTEM\u2011level actions, effectively elevating privileges and compromising system integrity."}}}}, "created": "2026-04-20T20:45:16.931514+00:00", "updated": "2026-04-20T20:45:16.931527+00:00", "vendors": []}