CVE-2026-0888: Mozilla Firefox

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Information disclosure in the XML component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

Affected products

• Mozilla Firefox: before 147.0 (fixed in 147.0)
• Mozilla Thunderbird: before 147.0 (fixed in 147.0)

Published 2026-01-13. Last modified 2026-06-17.