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Keycloak error_description injection on error pages that can trigger phishing attacks

Moderate severity GitHub Reviewed Published Oct 8, 2025 in keycloak/keycloak • Updated Oct 17, 2025

Package

maven org.keycloak:keycloak-account-ui (Maven)

Affected versions

< 26.2.9
>= 26.3.0, < 26.3.4

Patched versions

26.2.9
26.3.4
maven org.keycloak:keycloak-admin-ui (Maven)
< 26.2.9
>= 26.3.0, < 26.3.4
26.2.9
26.3.4

Description

Keycloak’s account console accepts 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.

References

@rmartinc rmartinc published to keycloak/keycloak Oct 8, 2025
Published to the GitHub Advisory Database Oct 17, 2025
Reviewed Oct 17, 2025
Last updated Oct 17, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(10th percentile)

Weaknesses

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Learn more on MITRE.

CVE ID

CVE-2025-10044

GHSA ID

GHSA-27gc-wj6x-9w55

Source code

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