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Fencer Vulns
medium 4.3

CVE-2025-10044 json

Keycloak: keycloak error_description injection on error pages

published 2025-09-05 14 mo ago modified 2026-10-18 21 d ago also GHSA-27gc-wj6x-9w55 , EUVD-2025-27029

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.keycloak:keycloak-account-ui 26.2.9, 26.3.4
  • maven org.keycloak:keycloak-admin-ui 26.2.9, 26.3.4
  • Keycloak keycloak 26.2.9
  • Red Hat Red Hat build of Keycloak 26.0 26.0-21, 26.0-22, 26.0.17-1
  • Red Hat Red Hat build of Keycloak 26.2 26.2-9, 26.2.9-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-10044 updated cvss 4.3

keycloak: Keycloak error_description injection on error pages

  • Red Hat build of Keycloak 26.0 rhbk/keycloak-rhel9 26.0-21, rhbk/keycloak-rhel9-operator 26.0-22, rhbk/keycloak-operator-bundle 26.0.17-1
    fixed: vendor fix RHSA-2025:19923
  • Red Hat build of Keycloak 26.0.17
    fixed: vendor fix RHSA-2025:19925
  • Red Hat build of Keycloak 26.2 rhbk/keycloak-rhel9 26.2-9, rhbk/keycloak-rhel9-operator 26.2-9, rhbk/keycloak-operator-bundle 26.2.9-1
    fixed: vendor fix RHSA-2025:16400
  • Red Hat build of Keycloak 26.2.9
    fixed: vendor fix RHSA-2025:16399

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
14 mo ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-account-ui
<26.2.9
>=26.3.0, <26.3.4
26.2.9
26.3.4
maven org.keycloak:keycloak-admin-ui
<26.2.9
>=26.3.0, <26.3.4
26.2.9
26.3.4

Affected products

  • Keycloak keycloak
  • Red Hat Red Hat build of Keycloak 26.0
  • Red Hat Red Hat build of Keycloak 26.0.17
  • Red Hat Red Hat build of Keycloak 26.2
  • Red Hat Red Hat build of Keycloak 26.2.9

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.