CVE-2026-107145

Medium

Description

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.

SeverityMedium

CVSS6.3

Exploit probability—

ProductAlexandregz Twofactor Gauthenticator

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-307CWE-307

How to fix

Update

alexandregz twofactor_gauthenticator4640889 or later

Patches

github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.md

Affected products

Product	Affected versions	Fixed in
alexandregz twofactor_gauthenticator	v < 4640889	4640889

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