CVSS 3.1
3.1 lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NCVE-2026-4874
Low (3.1) in redhat. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in org.keycloak:keycloak-services 26.4.13, 26.6.3.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-31)
- CWE
- CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Affected
- redhat:build_of_keycloak
- redhat:jboss_enterprise_application_platform
- redhat:jboss_enterprise_application_platform_expansion_pack
- redhat:single_sign-on
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-22rm-wp4x-v5cx | Maven | org.keycloak:keycloak-services | >=26.5.0 <26.6.3 | 26.6.3 |
| GHSA-22rm-wp4x-v5cx | Maven | org.keycloak:keycloak-services | <26.4.13 | 26.4.13 |