🛡️ CVE-2026-4874 — build-of-keycloak

🟢 CVSS 3.1 — Low ✅ No Known Exploit CWE-918 NVD
3.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Keycloak Server-Side Request Forgery via OIDC token endpoint manipulation

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2026-4874 is classified as CWE-918: Server-Side Request Forgery (SSRF). The server fetches a URL supplied by the caller, which can be pointed at internal systems it alone can reach.

Affected software

CVE-2026-4874 is recorded against 5 packages.

  • build-of-keycloak
  • jboss-enterprise-application-platform
  • jboss-enterprise-application-platform-expansion-pack
  • org.keycloak:keycloak-services (fixed in 26.4.13)
  • single-sign-on

Timeline and source

Published on 26 March 2026 and last revised on 26 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
bugzilla.redhat.com

Details

Severity LOW
CVSS Score 3.1
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE CWE-918
Public Exploit ✅ No
Source NVD
Published 2026-03-26
Updated 2026-08-12
Modified 2026-06-26
Fix URL N/A

Affected Packages

Software From version Fixed in
build-of-keycloak
jboss-enterprise-application-platform
jboss-enterprise-application-platform-expansion-pack
org.keycloak:keycloak-services 26.4.13
single-sign-on

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