vulnerability
MFSA2025-05 Thunderbird: Security Vulnerabilities fixed in Thunderbird ESR 128.6 (CVE-2025-0239)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 2 | (AV:L/AC:L/Au:N/C:N/I:P/A:N) | Jan 7, 2025 | Jan 10, 2025 | Feb 18, 2026 |
Severity
2
CVSS
(AV:L/AC:L/Au:N/C:N/I:P/A:N)
Published
Jan 7, 2025
Added
Jan 10, 2025
Modified
Feb 18, 2026
Description
When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability affects Firefox < 134, Firefox ESR < 128.6, Thunderbird < 134, and Thunderbird < 128.6.
Solution
mozilla-thunderbird-upgrade-128_6
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