vulnerability
Ubuntu: USN-7991-1 (CVE-2025-6434): Thunderbird vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:N/I:P/A:N) | Jun 24, 2025 | Jun 26, 2025 | Feb 4, 2026 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
Jun 24, 2025
Added
Jun 26, 2025
Modified
Feb 4, 2026
Description
The exception page for the HTTPS-Only feature, displayed when a website is opened via HTTP, lacked an anti-clickjacking delay, potentially allowing an attacker to trick a user into granting an exception and loading a webpage over HTTP. This vulnerability affects Firefox < 140 and Thunderbird < 140.
Solution
ubuntu-upgrade-thunderbird
References
- CVE-2025-6434
- https://attackerkb.com/topics/CVE-2025-6434
- CWE-1021
- UBUNTU-USN-7991-1
- URL-https://bugzilla.mozilla.org/show_bug.cgi?id=1955182
- URL-https://www.cve.org/CVERecord?id=CVE-2025-6434
- URL-https://www.mozilla.org/en-US/security/advisories/mfsa2025-51/#CVE-2025-6434
- URL-https://www.mozilla.org/security/advisories/mfsa2025-51/
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