6.3
MediumCVSS 4.0 · from CERT-PL
CVE-2026-107147
Authentication bypass by spoofing in twofactor_gauthenticator
twofactor_gauthenticator · CWE-290 · CWE-290Affectedtwofactor_gauthenticator
FixUpdate to 4640889 or newer
PublishedOct 27, 09:36 · CERT-PL
ScoredOct 27 · 6.3 · CERT-PL
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:10 UTC
What we know
No known exploitation. CISA KEV, checked 22:10 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 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.
From CERT-PL
Affected and fixed versions
ProductAffectedFixed intwofactor_gauthenticatorbefore 46408894640889
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known