Information disclosure in Mozilla Thunderbird - CVE-2025-3522

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Main Vulnerability Database Vulnerabilities #VU107463

Information disclosure in Mozilla Thunderbird - CVE-2025-3522

Published: April 15, 2025


Vulnerability identifier: #VU107463
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2025-3522
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a missing URL validation when processing the X-Mozilla-External-Attachment-URL header to handle externally hosted attachments. A remote attacker can send a specially crafted email to the victim that contains a link with an internally referenced document, such as "chrome://" or "chrome://" and force Thunderbird to share hashed Windows credentials with that URL, leading to information disclosure.


Affected software

Mozilla Thunderbird
Debian Linux
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Workstation Extension 15
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Slackware Linux
SUSE Package Hub 15
openSUSE Leap
Ubuntu
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
thunderbird
mozilla-thunderbird
thunderbird (Red Hat package)
MozillaThunderbird-debuginfo
MozillaThunderbird
MozillaThunderbird-debugsource
MozillaThunderbird-translations-other
MozillaThunderbird-translations-common
thunderbird (Debian package)
thunderbird-debuginfo
thunderbird-debugsource
thunderbird-librnp-rnp
thunderbird-wayland
thunderbird (Ubuntu package)

How to mitigate CVE-2025-3522

Install updates from vendor's website.

Mozilla Thunderbird - addressed in versions 128.9.2, 137.0.2
thunderbird - update to 128.9.0-2.0.1
mozilla-thunderbird - update to 128.9.2esr
thunderbird (Red Hat package) - addressed in versions 128.9.2-1.el8_2, 128.9.2-1.el8_4, 128.9.2-1.el8_6, 128.9.2-1.el8_8, 128.9.2-1.el8_10, 128.9.2-1.el9_0, 128.9.2-1.el9_2, 128.9.2-1.el9_4, 128.9.2-1.el9_5
MozillaThunderbird-debuginfo - update to 128.9.2-150200.8.209.1
MozillaThunderbird - update to 128.9.2-150200.8.209.1
MozillaThunderbird-debugsource - update to 128.9.2-150200.8.209.1
MozillaThunderbird-translations-other - update to 128.9.2-150200.8.209.1
MozillaThunderbird-translations-common - update to 128.9.2-150200.8.209.1
thunderbird (Debian package) - update to 1:128.10.0esr-1~deb12u1
thunderbird - update to 128.11.1-1
thunderbird-debuginfo - update to 128.11.1-1
thunderbird-debugsource - update to 128.11.1-1
thunderbird-librnp-rnp - update to 128.11.1-1
thunderbird-wayland - update to 128.11.1-1
thunderbird (Ubuntu package) - update to 1:128.12.0+build1-0ubuntu0.22.04.1

External References

Related Security Bulletins