CVE-2026-4874 — LOW (3.1) — White Hats Nepal

Vulnerability Description

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 Score

3.1

LOW

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Redhat	Build Of Keycloak	-
Redhat	Jboss Enterprise Application Platform	8.0.0
Redhat	Jboss Enterprise Application Platform Expansion Pack	-
Redhat	Single Sign-On	7.0

Related Weaknesses (CWE)

CWE-918

References

https://access.redhat.com/security/cve/CVE-2026-4874Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2451611Issue TrackingVendor Advisory

FAQ

What is CVE-2026-4874?

CVE-2026-4874 is a vulnerability with a CVSS score of 3.1 (LOW). 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 wh...

How severe is CVE-2026-4874?

CVE-2026-4874 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-4874?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak, Redhat Jboss Enterprise Application Platform, Redhat Jboss Enterprise Application Platform Expansion Pack, Redhat Single Sign-On.