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CVE-2026-127131

SOGo before 5.12.13 Missing Rate Limiting on TOTP Verification

  • Critical 9.1

Description

SOGo before 5.12.13 contains a missing rate limiting vulnerability in its web login TOTP verification that allows attackers who already possess a victim's password to brute-force the second-factor code without triggering any lockout. Attackers can send repeated POST requests to /SOGo/connect with wrong verification codes at high speed since failed TOTP attempts never increment the failed-login counter and SOGoMaximumFailedLoginCount does not apply, enabling indefinite guessing across 30-second code windows to bypass two-factor authentication.

Key facts

Published
12 Nov 2026
Last changed
12 Nov 2026
Assigned by
VulnCheck
EPSS
0.342% likely to be exploited in the next 30 days, higher than 28.191% of CVEs (scores for 15 Nov 2026)

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.1CVSS 4.0, Criticalfrom the CNA (VulnCheck)CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  • 7.4CVSS 3.1, Highfrom the CNA (VulnCheck)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
Alintosogo
  • Default status: unaffected
  • 0 up to but excluding 5.12.13 (affected)

Timeline

  1. 12 Nov 2026 Published

Weakness

References