CVE-2026-4874: Server-Side Request Forgery (SSRF) in Red Hat Red Hat build of Keycloak 26.4
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.
AI Analysis
Technical Summary
This vulnerability in Red Hat build of Keycloak 26.4 allows an authenticated attacker to perform SSRF by manipulating the client_session_host parameter during refresh token requests. The issue arises when the Keycloak client uses the backchannel.logout.url configured with the application.session.host placeholder. Exploiting this flaw enables the attacker to send HTTP requests from the Keycloak server’s network environment, which may be used to probe internal networks or APIs, resulting in information disclosure. The vulnerability has a CVSS 3.1 score of 3.1 (low severity). Red Hat has published security advisories (RHSA-2026:25097 and RHSA-2026:25098) and released updated Keycloak 26.6.3 images that include fixes for this and other security issues. No direct patch for 26.4 is mentioned, but upgrading to 26.6.3 is the recommended remediation.
Potential Impact
An authenticated attacker can exploit this SSRF vulnerability to make HTTP requests from the Keycloak server’s network context. This can potentially expose internal network resources or APIs, leading to information disclosure. The CVSS score of 3.1 reflects a low severity impact, primarily confidentiality-related, with no direct impact on integrity or availability reported.
Mitigation Recommendations
Red Hat has released updated Keycloak 26.6.3 images that address this vulnerability. Users should back up their existing installations, including configurations and databases, and upgrade to the fixed version 26.6.3 as provided by Red Hat. No other temporary or workaround mitigations are specified in the advisory. Patch status is confirmed by the vendor advisory. Users should follow Red Hat’s official update procedures to remediate this issue.
CVE-2026-4874: Server-Side Request Forgery (SSRF) in Red Hat Red Hat build of Keycloak 26.4
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 v3.1
Score 3.1low
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Red Hat build of Keycloak 26.4 allows an authenticated attacker to perform SSRF by manipulating the client_session_host parameter during refresh token requests. The issue arises when the Keycloak client uses the backchannel.logout.url configured with the application.session.host placeholder. Exploiting this flaw enables the attacker to send HTTP requests from the Keycloak server’s network environment, which may be used to probe internal networks or APIs, resulting in information disclosure. The vulnerability has a CVSS 3.1 score of 3.1 (low severity). Red Hat has published security advisories (RHSA-2026:25097 and RHSA-2026:25098) and released updated Keycloak 26.6.3 images that include fixes for this and other security issues. No direct patch for 26.4 is mentioned, but upgrading to 26.6.3 is the recommended remediation.
Potential Impact
An authenticated attacker can exploit this SSRF vulnerability to make HTTP requests from the Keycloak server’s network context. This can potentially expose internal network resources or APIs, leading to information disclosure. The CVSS score of 3.1 reflects a low severity impact, primarily confidentiality-related, with no direct impact on integrity or availability reported.
Mitigation Recommendations
Red Hat has released updated Keycloak 26.6.3 images that address this vulnerability. Users should back up their existing installations, including configurations and databases, and upgrade to the fixed version 26.6.3 as provided by Red Hat. No other temporary or workaround mitigations are specified in the advisory. Patch status is confirmed by the vendor advisory. Users should follow Red Hat’s official update procedures to remediate this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-03-26T05:47:45.449Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/errata/RHSA-2026:25098","vendor":"Red Hat"},{"url":"https://access.redhat.com/security/cve/CVE-2026-4874","vendor":"Red Hat"}]
Threat ID: 69c4e45ef4197a8e3b077baa
Added to database: 03/26/2026, 07:46:38 UTC
Last enriched: 06/26/2026, 12:21:12 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 242
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