CVE-2025-2817

Description

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 was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

PUBLISHED Reserved 2025-03-26 | Published 2025-04-29 | Updated 2026-04-13 | Assigner mozilla

Product status

Credits

Dong-uk Kim (@justlikebono)

References

lists.debian.org/debian-lts-announce/2025/05/msg00022.html

bugzilla.mozilla.org/show_bug.cgi?id=1917536

www.mozilla.org/security/advisories/mfsa2025-28/

www.mozilla.org/security/advisories/mfsa2025-29/

www.mozilla.org/security/advisories/mfsa2025-30/

www.mozilla.org/security/advisories/mfsa2025-31/

www.mozilla.org/security/advisories/mfsa2025-32/

cve.org (CVE-2025-2817)

nvd.nist.gov (CVE-2025-2817)

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