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CVE-2026-4874

Org.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side request forgery via oidc token endpoint manipulation

Published: Mar 26, 2026Updated: Jun 10, 2026 Sources: CVE List NVDCWE-918
NVD MITRE
3.1CVSSLOW
EPSS Score
0.3%
Top 83.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-918

Affected Products

build of keycloakredhat
On-prem
Security Products / identity-access-mgmt
jboss enterprise application platformredhat
On-premOS
Operating Systems / linux-distro
jboss enterprise application platform expansion packredhat
On-prem
Operating Systems / linux-distro
single sign-onredhat
On-premWeb App
Security Products / identity-access-mgmt
Red Hat build of Keycloak 26.6Red Hat
On-prem
Operating Systems / linux-distro
redhatcommercialUSOperating Systemsaka red hat
red hatcommercialUSOperating Systemsaka red hat
and 5 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Command and Control
Initial Access
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:25097
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:25098
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-4874
access.redhat.com
and 1 more references View all →

Timeline

Published
Mar 26, 2026
Last Updated
Jun 10, 2026

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