# MA-1359.072025: MyCERT Advisory - Security Updates – Mozilla Thunderbird

**Date:** 09 Jul 2025  
**Source:** https://www.mycert.org.my/portal/advisory?id=MA-1359.072025  
**Advisory ID:** MA-1359.072025

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**1.0 Introduction**
Recently, Mozilla has released security updates to address multiple high and moderate severity vulnerabilities in Thunderbird.
**2.0 Impact**
These vulnerabilities could allow attackers to crash applications or track users via a persistent browser UUID exposed by the WebCompat extension.
**3.0 Affected Products**
- Thunderbird version 140
- Thunderbird version 128.12
**4.0 Recommendations**
CyberSecurity Malaysia encourages users and administrators to review the following [Mozilla security advisory](https://www.mozilla.org/en-US/security/advisories/) and apply the necessary updates:
Kindly refer to the following URLs for more information: 
- <https://www.mozilla.org/en-US/security/advisories/mfsa2025-54/>
- <https://www.mozilla.org/en-US/security/advisories/mfsa2025-55/>
Generally, we advise users of these devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.
For further enquiries, please contact Cyber999 Incident the Response Centre through the following channels:
E-mail: cyber999[at]cybersecurity.my 
Phone: 1-300-88-2999 (monitored during business hours) 
Mobile: +60 19 2665850 (24x7 call incident reporting) 
Business Hours: Mon - Fri 08:30 -17:30 MYT 
Web: <https://www.cybersecurity.my>
**5.0    References**
- <https://www.mozilla.org/en-US/security/advisories/>
- <https://www.mozilla.org/en-US/security/advisories/mfsa2025-54/>
- <https://www.mozilla.org/en-US/security/advisories/mfsa2025-55/>