SB2025070308 - Multiple vulnerabilities in Mozilla Thunderbird 128.x
Published: July 3, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2025-6424)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in FontFaceSet. A remote attacker can trick the victim into opening a specially crafted website and execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
2) Information disclosure (CVE-ID: CVE-2025-6425)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the WebCompat extension shipped with Firefox allows to enumerate resources and obtain a persistent UUID that identifies the browser, and persists between containers and normal/private browsing mode, but not profiles.
3) Insufficient UI Warning of Dangerous Operations (CVE-ID: CVE-2025-6426)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to the terminal extension does not show a warning when opening an executable terminal filer on macOS. A remote attacker can trick the victim into executing an executable file and compromise the affected system.
Note, the vulnerability affects macOS installations only.
4) Input validation error (CVE-ID: CVE-2025-6429)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to incorrect parsing of embedded URLs that led to URLs being rewritten to the youtube.com domain. A remote attacker can use a specially crafted embed tag to bypass website security checks that restricted which domains users were allowed to embed.
5) Protection Mechanism Failure (CVE-ID: CVE-2025-6430)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to an error when handling embed or object tags. When a file download is specified via the Content-Disposition header, that directive would be ignored if the file was included via a <embed> or <object> tag, potentially making a website vulnerable to a cross-site scripting attack.
Remediation
Install update from vendor's website.