6.3
MediumCVSS 4.0 · from CERT-PL
CVE-2026-107145
Lack of rate-limiting in 2fa code check mechanism in twofactor_gauthenticator
twofactor_gauthenticator · CWE-307 · CWE-307Affectedtwofactor_gauthenticator
FixUpdate to 4640889 or newer
PublishedOct 27, 09:34 · CERT-PL
ScoredOct 27 · 6.3 · CERT-PL
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:09 UTC
What we know
No known exploitation. CISA KEV, checked 22:09 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.
It only works under certain conditions, which makes it harder to pull off. CVSS: high attack complexity.
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.
From CERT-PL
Affected and fixed versions
ProductAffectedFixed intwofactor_gauthenticatorbefore 46408894640889
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known