CVE-2026-107145
Lack of rate-limiting in 2fa code check mechanism in twofactor_gauthenticator
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: CERT-PLAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| twofactor_gauthenticator alexandregz https://github.com |
≥ 0; < 4640889 (affected, git)
Other versions: unaffected |
CNA: CERT-PL |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 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 | CNA: CERT-PL |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://cert.pl/en/posts/2026/10/CVE-2026-107145CNA: CERT-PL · third-party-advisory
- https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.mdCNA: CERT-PL · patch
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