CVE-2026-107147

Medium

Description

The twofactor_gauthenticator plugin for Roundcube is vulnerable to 2fa authentication bypass by spoofed client address headers. Due to the lack of validation of the Client-IP and X-Forwarded-For headers, an attacker who obtains user's password can spoof a whitelisted IP address, resulting in the second factor being bypassed. This issue was fixed in commit 4640889.

SeverityMedium

CVSS6.3

Exploit probability—

ProductAlexandregz Twofactor Gauthenticator

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-290CWE-290

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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