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TI-2026-81069 Aliases CVE-2026-107145GHSA-j947-85xj-mvc2

Missing rate limiting in Roundcube twofactor_gauthenticator 2FA checks

Priority LOW 28CWE-307Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-307.

Summary

The alexandregz twofactor_gauthenticator plugin for Roundcube, from 0 before commit 4640889, does not limit the rate of second-factor code checks (CWE-307). A remote attacker who obtains a user's password can submit arbitrary 6-digit codes, bypassing the second factor and gaining unauthorized access.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00301 23rd percentileScored 2026-11-07
Fix Fixed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

No affected products listed by the sources yet.

Remediation

Apply commit 4640889, which fixes the twofactor_gauthenticator plugin.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    alexandregz twofactor_gauthenticator 4640889

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-81071 Authentication bypass by spoofing in twofactor_gauthenticatorPriority LOW 28
    • TI-2026-81070 Session stays alive after failed 2FA in twofactor_gauthenticatorPriority LOW 28
    Show all 3 records →

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-107145
  2. 2026-10-27 Alias added: GHSA-j947-85xj-mvc2
  3. 2026-10-27 Priority changed: MEDIUM → LOW
  4. 2026-11-04 CISA SSVC decision points changed

References

Patch 1

Advisory 1

  • TI-2026-81071 Authentication bypass by spoofing in twofactor_gauthenticator CVSS 4.0MEDIUM 6.3
  • TI-2026-81070 Session stays alive after failed 2FA in twofactor_gauthenticator CVSS 4.0MEDIUM 6.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences