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MISP CVE-2026-9084

| EUVD-2026-31123 MEDIUM
Improper Authentication (CWE-287)
2026-05-20 CIRCL GHSA-5895-8h7c-2833
Authentication Bypass
6.0
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/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
Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
May 20, 2026 - 16:03 vuln.today
Analysis Generated
May 20, 2026 - 16:03 vuln.today

DescriptionNVD

MISP’s OIDC authentication plugin allowed automatic linking of an OIDC identity to an existing local user account based on the email claim when the local account had no stored sub value. Under insecure or untrusted IdP configurations where email ownership is not enforced, an attacker with a valid OIDC token could assert a victim’s email address and authenticate as that user, leading to account takeover.

AnalysisAI

Account takeover in MISP's OidcAuth plugin (versions 2.5.0 through 2.5.37) enables an unauthenticated attacker holding a valid OIDC token from an insecure or untrusted IdP to authenticate as any local MISP user whose account has a NULL stored sub value. The vulnerability arises because the plugin unconditionally trusted the OIDC email claim to link identities to existing local accounts without verifying email ownership, bypassing authentication controls entirely (CWE-287). …

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CVE-2026-9084 vulnerability details – vuln.today
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