What is CVE-2026-4874?

CVE-2026-4874 is a low-severity vulnerability in Red Hat Build Of Keycloak, classified under Server-Side Request Forgery (SSRF). CVSS score: 3.1/10. Published 2026-03-26.

How severe is CVE-2026-4874?

Low severity. CVSS v3 base score is 3.1 out of 10.

SSRF in Red Hat Build Of Keycloak

CVE-2026-4874

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 u…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (1.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

access.redhat.com/security/cve/CVE-2026-4874 (vdb-entry, x_refsource_REDHAT)
RHBZ#2451611 (issue-tracking, x_refsource_REDHAT)

Frequently asked questions

What is CVE-2026-4874?: CVE-2026-4874 is a low-severity vulnerability in Red Hat Build Of Keycloak, classified under Server-Side Request Forgery (SSRF). CVSS score: 3.1/10. Published 2026-03-26.
How severe is CVE-2026-4874?: Low severity. CVSS v3 base score is 3.1 out of 10.