Server-Side Request Forgery (SSRF) Affecting keycloak-fips-26.5 package, versions <26.5.6-r4


Severity

Recommended
0.0
low
0
10

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Threat Intelligence

EPSS
0.33% (24th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-KEYCLOAKFIPS265-15951946
  • published9 Apr 2026
  • disclosed26 Mar 2026

Introduced: 26 Mar 2026

CVE-2026-4874  (opens in a new tab)
CWE-918  (opens in a new tab)

How to fix?

Upgrade Chainguard keycloak-fips-26.5 to version 26.5.6-r4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream keycloak-fips-26.5 package and not the keycloak-fips-26.5 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

A flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the client_session_host parameter during refresh token requests. This occurs when a Keycloak client is configured to use the backchannel.logout.url with the application.session.host placeholder. Successful exploitation allows the attacker to make HTTP requests from the Keycloak server’s network context, potentially probing internal networks or internal APIs, leading to information disclosure.

CVSS Base Scores

version 3.1