CVE-2026-51584

SSO Authentication Bypass Allows Account Takeover in UseMemos 0.27.1

Published Aug 11, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title SSO Authentication Bypass Allows Account Takeover in UseMemos 0.27.1
Type Values Removed Values Added
Title SSO Account Takeover via Unbound Identifier in usememos SignIn Handler
Weaknesses CWE-285
CWE-306
Type Values Removed Values Added
Weaknesses CWE-287
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title SSO Account Takeover via Unbound Identifier in usememos SignIn Handler
Weaknesses CWE-285
CWE-306
Type Values Removed Values Added
First Time appeared Usememos
Usememos memos
Vendors & Products Usememos
Usememos memos
Type Values Removed Values Added
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.
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Aug 12, 2026, 6:23 PM
Reserved
Jun 8, 2026, 12:00 AM
Status
Deferred
Published
Aug 11, 2026, 2:17 PM
Modified
Aug 31, 2026, 7:33 PM