CVE-2026-107145

Lack of rate-limiting in 2fa code check mechanism in twofactor_gauthenticator

State: Published
Severity: 6.3 Medium
Published: Oct 27, 2026
Updated: Oct 27, 2026
Reserved: Oct 7, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N	CERT-PL

Weaknesses

CWE-307 Improper restriction of excessive authentication attempts

Affected Products

Product	Versions
twofactor_gauthenticatoralexandregz	before 4640889Affected

References

https://cert.pl/en/posts/2026/10/CVE-2026-107145third-party-advisory
https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.mdpatch

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