# MA-1330.052025: MyCERT Advisory - Security Updates – Mozilla Firefox

**Date:** 26 May 2025  
**Source:** https://www.mycert.org.my/portal/advisory?id=MA-1330.052025  
**Advisory ID:** MA-1330.052025

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**1.0 Introduction**
Recently, Mozilla has released security updates to address multiple vulnerabilities in its Thunderbird products.
**2.0 Impact**
These vulnerabilities could allow email sender spoofing, unsolicited file downloads, disk space exhaustion, credential leakage, and arbitrary JavaScript execution.
**3.0 Affected Products**
- Thunderbird versions prior to 138.0.1
- Thunderbird versions prior to 128.10.1
**4.0 Recommendations**
CyberSecurity Malaysia encourages users and administrators to review the following Mozilla security advisory and apply the necessary updates:
Kindly refer to the following URLs for more information: 
- <https://www.mozilla.org/en-US/security/advisories/mfsa2025-34/>
- <https://www.mozilla.org/en-US/security/advisories/mfsa2025-35/>
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.mycert.org.my](https://www.mycert.org.my/) 
**5.0    References**
- <https://www.mozilla.org/en-US/security/advisories/>
- <https://www.mozilla.org/en-US/security/advisories/mfsa2025-34/>
- <https://www.mozilla.org/en-US/security/advisories/mfsa2025-35/>