CVE-2023-0264

MEDIUM

Keycloak - Authenticated Session Impersonation via OpenID Connect Request Data

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2023-0264. PoCs published by twwd.

AI-analyzed exploit summary This PoC demonstrates a session hijacking vulnerability in Keycloak during the authorization code flow, allowing an attacker to impersonate another user by manipulating session IDs.

Description

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.

Exploits (1)

nomisec WORKING POC 7 stars
by twwd · poc
https://github.com/twwd/CVE-2023-0264

This PoC demonstrates a session hijacking vulnerability in Keycloak during the authorization code flow, allowing an attacker to impersonate another user by manipulating session IDs.

Classification
Working Poc 95%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Keycloak (version not specified)
Auth required
Prerequisites: Docker · curl · jq · Python3 or HTTP server · Keycloak instance
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (1)

Core 1

Scores

CVSS v3 5.0
EPSS 0.0294
EPSS Percentile 86.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

Details

CWE
CWE-287
Status published
Products (10)
org.keycloak/keycloak-services 0 - 21.0.1Maven
redhat/keycloak < 18.0.6
redhat/openshift_container_platform 4.9
redhat/openshift_container_platform 4.10
redhat/openshift_container_platform_for_ibm_linuxone 4.9
redhat/openshift_container_platform_for_ibm_linuxone 4.10
redhat/openshift_container_platform_ibm_z_systems 4.9
redhat/openshift_container_platform_ibm_z_systems 4.10
redhat/single_sign-on
redhat/single_sign-on < 7.6.2
Published Aug 04, 2023
Tracked Since Feb 18, 2026