CVE-2025-2817High· 8.8▾ TwilightThunderbird'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 int…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 30.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.7%
Last analysed / modified upstream
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.
firefox < 115.23.0firefox < 138.0firefox >= 116.0, < 128.10.0thunderbird < 128.10.0thunderbird >= 129.0, < 138.0Upgrade past the affected range:
firefox 128.10.0thunderbird 138.0Connected by shared product, vendor, weakness, or advisory.
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CVE-2026-118024NoneUse-after-free in the Graphics: Text component
CVE-2026-118026NoneInvalid pointer in the JavaScript: GC component