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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| misp | misp | unaffected |
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Fixes
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References
History
Wed, 20 May 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | MISP OIDC authentication bypass via automatic email-based account linking under insecure IdP configurations | |
| Weaknesses | CWE-287 | |
| References |
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| Metrics |
cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: CIRCL
Published:
Updated: 2026-05-20T14:22:59.019Z
Reserved: 2026-05-20T14:21:56.589Z
Link: CVE-2026-9084
Vulnrichment
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Redhat
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OpenCVE Enrichment
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Weaknesses