Mozilla released Firefox 154 and Thunderbird 154 security updates that fix dozens of serious flaws affecting browser and email users. Firefox 154 patches 58 CVEs, including 20 high-severity issues such as use-after-free bugs, privilege-escalation flaws, information disclosure bugs, a sandbox escape, and site-isolation and mitigation-bypass weaknesses; ESR 115.39, 140.14, and 153.1 plus Thunderbird 140.14 and 153.1 also received related fixes.
Why it matters: These are widely used internet-facing applications, so unpatched systems can be exposed to code-execution and browser-compromise risks. Users and organizations should update Firefox, Thunderbird, and supported ESR versions promptly.
Ionut Arghire
2026.08.19
100% relevant
The article reports Mozilla's newly released Firefox 154 and Thunderbird 154 patch cycle as a distinct update event not already represented in the tracked stories.
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