CVE-2026-107145 PUBLISHED

The twofactor_gauthenticator plugin for Roundcube is vulnerable to brute-forcing of the second-factor code. Due to the lack of rate limiting, an attacker who obtains user's password can submit arbitrary 6-digit codes, resulting in second-factor bypass and unauthorized access to the system.

This issue was fixed in commit 4640889.

• Marek Figielski (Vanilla.pl) finder

• https://cert.pl/en/posts/2026/10/CVE-2026-107145
• https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.md

• CWE-307 Improper restriction of excessive authentication attempts CWE

• CAPEC-112 Brute Force