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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
alexandregz twofactor_gauthenticator unaffected
Version Status Constraints
0 affected < 4640889

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Project Subscriptions

Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://cert.pl/en/posts/2026/10/CVE-2026-107145 cve-icon cve-icon
https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.md cve-icon cve-icon
History

Tue, 27 Oct 2026 09:45:00 +0000

Type Values Removed Values Added
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.
Title Authentication bypass by spoofing in twofactor_gauthenticator
First Time appeared Alexandregz
Alexandregz twofactor Gauthenticator
Weaknesses CWE-290
CPEs cpe:2.3:a:alexandregz:twofactor_gauthenticator:*:*:*:*:*:*:*:*
Vendors & Products Alexandregz
Alexandregz twofactor Gauthenticator
References
Metrics cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: CERT-PL

Published:

Updated: 2026-10-27T09:36:01.938Z

Reserved: 2026-10-07T08:44:03.177Z

Link: CVE-2026-107147

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-27T10:16:54.290

Modified: 2026-10-27T10:16:54.290

Link: CVE-2026-107147

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-27T10:30:11Z

Weaknesses