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Vulnerability record · CVE-2026-51584 · published 11 August 2026

CVE-2026-51584: Improper authentication vulnerability

An issue in usememos v0.27.1 allows a remote attacker to achieve account takeover via the ssoCredentials branch of the SignIn handler in server/router/api/v1/auth_service.go, because SSO identity is matched only on an attacker-controllable identifier without binding to the IdP's stable subject claim.

9.8 CVSS 3.1 Critical EPSS 0.61% · top 52.9% CWE-287 · Improper authentication Deferred
9.8CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
31 Aug 2026Last modified by NVD

Description

An issue in usememos v0.27.1 allows a remote attacker to achieve account takeover via the ssoCredentials branch of the SignIn handler in server/router/api/v1/auth_service.go, because SSO identity is matched only on an attacker-controllable identifier without binding to the IdP's stable subject claim.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://gist.github.com/seiyaibuki0523/33a4c06eb7d10914e5e5152ecd5100ec
https://github.com/usememos/memos

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Source: NIST National Vulnerability Database (record CVE-2026-51584), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.