CVE-2025-10044: XSS (CVSS 4.3)

Description

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.

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CVSS v3.1 Score

4.3

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other References

https://access.redhat.com/errata/RHSA-2025:16399 https://access.redhat.com/errata/RHSA-2025:16400 https://access.redhat.com/errata/RHSA-2025:19923 https://access.redhat.com/errata/RHSA-2025:19925 https://access.redhat.com/security/cve/CVE-2025-10044 https://bugzilla.redhat.com/show_bug.cgi?id=2393551 https://github.com/keycloak/keycloak/pull/42443

Frequently Asked Questions

What is CVE-2025-10044? +

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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-10044? +

CVE-2025-10044 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2025-10044? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-10044