EUVD-2026-56175
GHSA-wgqp-f2p3-x7mp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network attack (PR:N/AV:N), but requires SSO to be configured and a known target identifier, so AC:H; account takeover exposes and alters victim data (C:H/I:H) without inherent availability loss (A:N).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
SSO-based account takeover in usememos Memos v0.27.1 lets a remote, unauthenticated attacker impersonate any user by exploiting the ssoCredentials path of the SignIn handler (server/router/api/v1/auth_service.go), which matches a federated identity solely on an attacker-controllable identifier (e.g. email or username) instead of the identity provider's stable subject claim. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Memos instance must have SSO/OIDC (identity-provider) login enabled - this is the concrete, required feature; against a Memos deployment using only local password authentication the ssoCredentials branch is unreachable and the flaw is not exploitable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The raw signals are mixed: CVSS 9.8 with an AV:N/AC:L/PR:N/UI:N vector implies trivial remote unauthenticated exploitation, but EPSS is only 0.22% (13th percentile) and the CVE is not in CISA KEV, indicating no evidence of mass, automated exploitation yet. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch version is identified in the available data at time of analysis, so the primary action is to monitor the upstream project (https://github.com/usememos/memos) for a fixed release that binds SSO identities to the IdP stable subject claim and to upgrade as soon as one is published; do not rely on an invented version number. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Immediately disable OIDC/OAuth SSO authentication in usememos Memos v0.27.1 and revert to local authentication only; simultaneously audit all account access logs for unauthorized login attempts or administrative changes. …
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Same weakness CWE-287 – Improper Authentication
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External POC / Exploit Code
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