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. Any deployment that has an OIDC/OAuth SSO provider enabled is affected, and a successful attack yields full control of the targeted account, including potentially administrative accounts. The flaw carries CVSS 9.8 and CWE-287; there is no public exploit identified as weaponized at time of analysis, though a referenced GitHub gist appears to be a researcher write-up, and EPSS is low at 0.22%.
Technical ContextAI
Memos is a self-hosted, open-source note/memo application written in Go with a gRPC/REST API. The vulnerability lives in the single-sign-on branch of the authentication service, where an external identity from an IdP is reconciled to a local Memos account. Secure federated-login design requires binding the local account to the IdP's immutable 'sub' (subject) claim, because mutable attributes like email, preferred_username, or display name can be changed, spoofed, or reused across IdPs. Here the code keys the lookup on such an attacker-controllable identifier without also verifying the stable subject, which is a classic CWE-287 (Improper Authentication) trust-boundary error: the application trusts a claim the user can influence to decide 'who' is logging in. The CPE string provided (cpe:2.3:a:n/a:n/a:*) is a placeholder and identifies no concrete product, so affected-product scope must be taken from the description (usememos/memos v0.27.1) rather than NVD CPE data.
RemediationAI
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. As an immediate compensating control, disable SSO/OIDC login on Memos instances until a fix is available and require local credential authentication - this fully removes the vulnerable code path at the cost of user login convenience. If SSO cannot be disabled, restrict the Memos instance and its auth endpoints to trusted networks/VPN and place it behind an authenticating reverse proxy, and where the IdP allows, lock provisioning so that new SSO logins cannot auto-map onto or create existing privileged accounts, accepting the operational overhead of manual account linking. Review authentication logs for unexpected SSO logins mapping to existing accounts. Advisory tracking is at https://nvd.nist.gov/vuln/detail/CVE-2026-51584.
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Same weakness CWE-287 – Improper Authentication
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today