# CVE-2026-127111: SOGo before 5.12.13 Unauthenticated Password Recovery Brute Force

Status: published. Published: 2026-11-12. Updated: 2026-11-13.

SOGo before 5.12.13 contains an improper restriction of excessive authentication attempts vulnerability that allows unauthenticated attackers to reset account passwords by repeatedly guessing secret-question answers via the passwordRecoveryCheck endpoint without lockout or rate limiting. Attackers can submit unlimited candidate answers to obtain a valid recovery JWT, then use it to change the account password without the old credential and log in via the connect endpoint, achieving full account takeover on accounts without TOTP enabled.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/Alinto/sogo/releases/tag/SOGo-5.12.13

## Affected products and versions

- Alinto / sogo (Alinto/sogo): ≥ 0; < 5.12.13 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 9.1 (critical); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.4 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N; source: CNA: VulnCheck

- CVSS 4.0: 9.1 (critical); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 7.4 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.33% as of 2026-11-13; percentile 26.48%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-307

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/Alinto/sogo/releases/tag/SOGo-5.12.13 (CNA: VulnCheck; patch, release-notes)

- https://www.vulncheck.com/advisories/sogo-before-unauthenticated-password-recovery-brute-force (CNA: VulnCheck; third-party-advisory)

- https://github.com/Alinto/sogo/releases/tag/SOGo-5.12.13 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/sogo-before-unauthenticated-password-recovery-brute-force (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-127111; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-127111; retrieved 2026-11-12; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-127111; retrieved 2026-11-13; source updated Not reported

Revision: 4841bca114b719cbd49f3eeb3170864d4dee7c25799fcbe0f17c7803002a0f3c

Canonical: https://y2.dev/cve/CVE-2026-127111

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