Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-22rm-wp4x-v5cx
Advisory ID github_osv/GHSA-22rm-wp4x-v5cx
Aliases CVE-2026-4874
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 2.8
Risk 1.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-918 Server-Side Request Forgery (SSRF)
System Score Found at
cvssv3.1 3.1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-22rm-wp4x-v5cx/GHSA-22rm-wp4x-v5cx.json
generic_textual LOW
Reference id Reference type URL
https://access.redhat.com/errata/RHSA-2026:30049
https://access.redhat.com/errata/RHSA-2026:30050
https://github.com/keycloak/keycloak
https://github.com/keycloak/keycloak/commit/00dd0dd716c4319d3bac3eb2f2ac22d2a94f79fd
https://github.com/keycloak/keycloak/commit/63de0efd351a7a684212a042a12271908f63f0ee
https://github.com/keycloak/keycloak/issues/47935
https://github.com/keycloak/keycloak/pull/49682
https://github.com/keycloak/keycloak/pull/49685
CVE-2026-4874 Advisory https://access.redhat.com/security/cve/CVE-2026-4874
CVE-2026-4874 https://nvd.nist.gov/vuln/detail/CVE-2026-4874
RHSA-2026:25097 Advisory https://access.redhat.com/errata/RHSA-2026:25097
RHSA-2026:25098 Advisory https://access.redhat.com/errata/RHSA-2026:25098
show_bug.cgi?id=2451611 Bug https://bugzilla.redhat.com/show_bug.cgi?id=2451611
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-22rm-wp4x-v5cx/GHSA-22rm-wp4x-v5cx.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-26T13:53:59Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/4xxx/CVE-2026-4874.json

Source Advisory: vulnrichment/CVE-2026-4874

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]