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Vulnerability record · CVE-2026-4874 · published 26 March 2026

CVE-2026-4874: Redhat build of keycloak server-side request forgery (ssrf) vulnerability

Redhat · Build Of Keycloak

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.

3.1 CVSS 3.1 Low EPSS 0.33% · top 76.3% CWE-918 · Server-side request forgery (SSRF)
3.1CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
6References
26 Jun 2026Last modified by NVD

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:25097
https://access.redhat.com/errata/RHSA-2026:25098
https://access.redhat.com/errata/RHSA-2026:30049
https://access.redhat.com/errata/RHSA-2026:30050
https://access.redhat.com/security/cve/CVE-2026-4874 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2451611 Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-4874), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.