Live › vulnerability › CVE-2026-107147
Go to dashboardThe twofactor_gauthenticator plugin for Roundcube trusts the Client-IP and X-Forwarded-For headers without validation. An attacker who already has a user's password can spoof a whitelisted IP address and skip the second factor login step.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-27 10:31 UTC. All times on this page are UTC.
Deployments of Roundcube that run the twofactor_gauthenticator plugin and use an IP whitelist for second-factor exemption are exposed, since the bypass depends on the whitelist trusting spoofed headers. Sites without this plugin, or without a whitelisted-IP exemption, are not affected by this description.
No product ranges from the sources yet.
twofactor_gauthenticator plugin is installed in the Roundcube plugins/ directory, and which commit or version it is at.twofactor_gauthenticator to a build that includes commit 4640889; the release version is unknown from the sources.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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