CVE-2025-10044: Keycloak

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in Keycloak. Keycloak’s account console and other pages accept arbitrary text in the error_description query parameter. This text is directly rendered in error pages without validation or sanitization. While HTML encoding prevents XSS, an attacker can craft URLs with misleading messages (e.g., fake support phone numbers or URLs), which are displayed within the trusted Keycloak UI. This creates a phishing vector, potentially tricking users into contacting malicious actors.

Affected products

• Keycloak Keycloak: before 26.2.9 (fixed in 26.2.9)
• Red Hat Red Hat Build Of Keycloak 26.0: before 26.0.17-1 (fixed in 26.0.17-1); before 26.0-21 (fixed in 26.0-21); before 26.0-22 (fixed in 26.0-22)
• Red Hat Red Hat Build Of Keycloak 26.0.17
• Red Hat Red Hat Build Of Keycloak 26.2: before 26.2.9-1 (fixed in 26.2.9-1); before 26.2-9 (fixed in 26.2-9)
• Red Hat Red Hat Build Of Keycloak 26.2.9

Published 2025-09-05. Last modified 2026-06-17.