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CVE-2023-0264

MediumPublished

A flaw was found in Keycloaks OpenID Connect user authentication, which may incorrectly authenticate requests. An authenticated attacker who could obtain...

Published: Aug 4, 2023
Updated: Aug 2, 2024
Assigning CNA: redhat
Evidence observed: Aug 5, 2026

Primary CVSS

5.0/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS probability estimate

1.3%

Low · next 30 days

Percentile: 68.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

A flaw was found in Keycloaks OpenID Connect user authentication, which may incorrectly authenticate requests. An authenticated attacker who could obtain information from a user request within the same realm could use that data to impersonate the victim and generate new session tokens. This issue could impact confidentiality, integrity, and availability.

Sources

CVE-2023-0264PoC
A small PoC for the Keycloak vulnerability CVE-2023-0264
pocKeycloakCVE-2023-0264PoC
Proof-of-concept exploit for CVE-2023-0264 (Keycloak OIDC session hijacking) with a frontend for session_id substitution and an agent that detects the attack.

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