SB2026012911 - Information disclosure in Mozilla Thunderbird
Published: January 29, 2026
Security Bulletin ID
SB2026012911
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Information disclosure (CVE-ID: CVE-2026-0818)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the way CSS is handled within the application. A remote attacker can exfiltrate content from partially encrypted emails when allowing remote content.
Remediation
Install update from vendor's website.