CVE-2026-107147 Authentication bypass by spoofing in twofactor_gauthenticator
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-107147?
CVE-2026-107147 is a medium-severity vulnerability in alexandregz twofactor_gauthenticator, published on 27 Oct 2026.
Official 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.
Weakness: CWE-290
Which versions are affected by CVE-2026-107147?
How do I fix CVE-2026-107147?
No fix has been published for CVE-2026-107147 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-107147 being exploited?
There is no known exploitation of CVE-2026-107147 in the wild and no public exploit code.
Sources
Also known as GHSA-f37x-h4hh-7q49, UBUNTU-CVE-2026-107147.