🛡️ CVE-2026-4874 — build-of-keycloak
Description
Keycloak Server-Side Request Forgery via OIDC token endpoint manipulation
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.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.
Weakness class
CVE-2026-4874 is classified as CWE-918: Server-Side Request Forgery (SSRF). The server fetches a URL supplied by the caller, which can be pointed at internal systems it alone can reach.
Affected software
CVE-2026-4874 is recorded against 5 packages.
- build-of-keycloak
- jboss-enterprise-application-platform
- jboss-enterprise-application-platform-expansion-pack
- org.keycloak:keycloak-services (fixed in 26.4.13)
- single-sign-on
Timeline and source
Published on 26 March 2026 and last revised on 26 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.
References
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
bugzilla.redhat.com
Details
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| build-of-keycloak | — | — |
| jboss-enterprise-application-platform | — | — |
| jboss-enterprise-application-platform-expansion-pack | — | — |
| org.keycloak:keycloak-services | — | 26.4.13 |
| single-sign-on | — | — |
References
Similar Threats
- High CVE-2026-15572
- High CVE-2026-15573
- Medium CVE-2026-15943
- Medium CVE-2026-15945
- Medium CVE-2026-12388
More CVE 2026 advisories
Browse all of CVE 2026 in the advisory index.
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