CVE-2026-18209
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
Keycloak-services: keycloak-services: oidc redirect_uri fragment bypass in http parameter pollution check
A flaw was found in the keycloak-services component of Keycloak, which handles OpenID Connect (OIDC) authentication flows. The issue occurs because the security check designed to prevent HTTP parameter pollution only inspects the query portion of a redirect URL and ignores the fragment portion. When a client is configured with a wildcard redirect URI, an attacker can use this to inject duplicate security parameters into the login response. If a client application is not configured correctly, it might trust the attacker's injected data instead of the real security information from Keycloak, leading to session fixation or account confusion.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Red Hat build of Keycloak 26.6
- Vendor
- Red Hat
- Product
- Red Hat build of Keycloak 26.6
- Platforms
- Unknown
- Default status
affected- Package
- rhbk/keycloak-operator-bundle
- Package collection
- https://catalog.redhat.com/software/containers/
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 26.6.7-3 | unaffected | rpm | * | Unavailable | None listed |
Red Hat build of Keycloak 26.6
- Vendor
- Red Hat
- Product
- Red Hat build of Keycloak 26.6
- Platforms
- Unknown
- Default status
affected- Package
- rhbk/keycloak-rhel9
- Package collection
- https://catalog.redhat.com/software/containers/
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 26.6-20 | unaffected | rpm | * | Unavailable | None listed |
Red Hat build of Keycloak 26.6
- Vendor
- Red Hat
- Product
- Red Hat build of Keycloak 26.6
- Platforms
- Unknown
- Default status
affected- Package
- rhbk/keycloak-rhel9-operator
- Package collection
- https://catalog.redhat.com/software/containers/
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 26.6-20 | unaffected | rpm | * | Unavailable | None listed |
Red Hat build of Keycloak 26.6.7
- Vendor
- Red Hat
- Product
- Red Hat build of Keycloak 26.6.7
- Platforms
- Unknown
- Default status
unaffected- Package
- keycloak-services
- Package collection
- https://access.redhat.com/downloads/content/package-browser/
No explicit version tuples; consult this entry's default status.
Red Hat build of Keycloak 26.6.7
- Vendor
- Red Hat
- Product
- Red Hat build of Keycloak 26.6.7
- Platforms
- Unknown
- Default status
unaffected- Package
- rhbk-keycloak-rhel9/rhbk-keycloak-rhel9
- Package collection
- https://access.redhat.com/downloads/content/package-browser/
No explicit version tuples; consult this entry's default status.
Red Hat build of Keycloak 26.6.7
- Vendor
- Red Hat
- Product
- Red Hat build of Keycloak 26.6.7
- Platforms
- Unknown
- Default status
unaffected- Package
- rhbk-openshift-rhel9/rhbk-openshift-rhel9
- Package collection
- https://access.redhat.com/downloads/content/package-browser/
No explicit version tuples; consult this entry's default status.
Red Hat Data Grid 8
- Vendor
- Red Hat
- Product
- Red Hat Data Grid 8
- Platforms
- Unknown
- Default status
unaffected- Package
- keycloak-services
- Package collection
- https://access.redhat.com/downloads/content/package-browser/
No explicit version tuples; consult this entry's default status.
Red Hat JBoss Enterprise Application Platform Expansion Pack
- Vendor
- Red Hat
- Product
- Red Hat JBoss Enterprise Application Platform Expansion Pack
- Platforms
- Unknown
- Default status
unaffected- Package
- keycloak-services
- Package collection
- https://access.redhat.com/jbossnetwork/restricted/listSoftware.html
No explicit version tuples; consult this entry's default status.
Red Hat Single Sign-On 7
- Vendor
- Red Hat
- Product
- Red Hat Single Sign-On 7
- Platforms
- Unknown
- Default status
unaffected- Package
- keycloak-services
- Package collection
- https://access.redhat.com/downloads/content/package-browser/
No explicit version tuples; consult this entry's default status.