CVSS 4.0
9.1 criticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:NCVE-2026-127131 SOGo before 5.12.13 Missing Rate Limiting on TOTP Verification
Critical (9.1) in alinto sogo. EPSS 0.3% estimated probability of exploitation activity in the next 30 days.
On this page
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.
Severity
CVSS 3.1
7.4 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N- EPSS
- 0.3% estimated probability of exploitation activity in the next 30 days; 28th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CWE
- CWE-307 Improper Restriction of Excessive Authentication Attempts
- OWASP Top 10
- A07:2025 Authentication Failures
- Published
- Modified
- Assigned by
- VulnCheck (CNA)
- NVD analysis
- Deferred: the NVD does not plan to analyze it
- Record from
- the NVD, synced
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| Alinto sogo | before 5.12.13 |
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12, 13 | sogo | no fix listed | DEBIAN-CVE-2026-127131 |
| Ubuntu | 26.10, Pro:16.04:LTS, Pro:18.04:LTS and 3 more | sogo | no fix listed | UBUNTU-CVE-2026-127131 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu.
Attack patterns (CAPEC)
- CAPEC-16 Dictionary-based Password Attack Likelihood: Medium · Severity: High
- CAPEC-49 Password Brute Forcing Likelihood: Medium · Severity: High
- CAPEC-560 Use of Known Domain Credentials Likelihood: High · Severity: High
- CAPEC-565 Password Spraying Likelihood: High · Severity: High
- CAPEC-600 Credential Stuffing Likelihood: High · Severity: High
- CAPEC-652 Use of Known Kerberos Credentials Likelihood: Medium · Severity: High
- CAPEC-653 Use of Known Operating System Credentials Likelihood: High · Severity: High
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.
History
- The NVD deferred its analysis
Changes since this site first stored the record. The same for every record: /api/public/changes.