medium4.2
CVE-2026-9689
A flaw was found in Keycloak, an open-source identity and access management solution.
Impact
A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.keycloak:keycloak-services | >= 26.5.0, <= 26.6.4 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Redhat | Build Of Keycloak | All versions |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-wcvj-vpvw-9rr5
- https://nvd.nist.gov/vuln/detail/CVE-2026-9689
- https://access.redhat.com/security/cve/CVE-2026-9689
- https://bugzilla.redhat.com/show_bug.cgi?id=2481845
- https://github.com/keycloak/keycloak/issues/49430
- https://github.com/keycloak/keycloak/pull/49959
- https://github.com/keycloak/keycloak/commit/18832bcae5bebd5a1d66c2ec5fcd640e576fa625
- https://github.com/keycloak/keycloak/commit/1f58a4b79a258bcf2ef86b58fbf0016cdb91291f
- https://github.com/keycloak/keycloak/commit/267a1a33d4dc1eac7622614ba9772b4e1e35726f
- https://access.redhat.com/errata/RHSA-2026:50846
- https://access.redhat.com/errata/RHSA-2026:50847
- https://access.redhat.com/errata/RHSA-2026:50848
- https://access.redhat.com/errata/RHSA-2026:50849