CVE-2026-9793
Fixed in a distro release EPSS <1%CVSS 5.9
A flaw was found in Keycloak. When a JSON Web Encryption (JWE) encrypted request object is submitted, Keycloak may incorrectly process unsigned claims if the decrypted content is raw JSON, bypassing the configured signature policy. This allows a remote attacker to submit unauthorized claims, leading to a compromise of data integrity within the OpenID Connect (OIDC) authorization flow. While a redirect URI allowlist acts as a compensating control, this vulnerability violates OIDC Core and Financial-grade API (FAPI) signing requirements.
Products: Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4.14, Red Hat build of Keycloak 26.6, Red Hat build of Keycloak 26.6.5
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Maven | org.keycloak:keycloak-services | no fix |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | keycloak-26.4 | no fix |
| Chainguard | keycloak-26.4-iamguarded-compat | no fix |
| Chainguard | keycloak-26.5 | no fix |
| Chainguard | keycloak-26.5-iamguarded-compat | no fix |
| Chainguard | keycloak-26.6 | 26.6.6-r0 |
| Chainguard | keycloak-26.6-iamguarded-compat | 26.6.6-r0 |
| Chainguard | keycloak-fips-26.4 | no fix |
| Chainguard | keycloak-fips-26.4-iamguarded-fips | no fix |
| Chainguard | keycloak-fips-26.5 | no fix |
| Chainguard | keycloak-fips-26.5-iamguarded-fips | no fix |
| Chainguard | keycloak-fips-26.6 | 26.6.6-r0 |
| Chainguard | keycloak-fips-26.6-iamguarded-fips | 26.6.6-r0 |
| Chainguard | request-9047-keycloak-fips-26.4 | no fix |
| Chainguard | request-9047-keycloak-fips-26.4-iamguarded-fips | no fix |
| Chainguard | request-9047-keycloak-fips-26.5 | no fix |
| Chainguard | request-9047-keycloak-fips-26.5-iamguarded-fips | no fix |
| Chainguard | request-9047-keycloak-fips-26.6 | 26.6.6-r0 |
| Chainguard | request-9047-keycloak-fips-26.6-iamguarded-fips | 26.6.6-r0 |
| Wolfi | keycloak-26.4 | no fix |
| Wolfi | keycloak-26.4-iamguarded-compat | no fix |
| Wolfi | keycloak-26.5 | no fix |
| Wolfi | keycloak-26.5-iamguarded-compat | no fix |
| Wolfi | keycloak-26.6 | 26.6.6-r0 |
| Wolfi | keycloak-26.6-iamguarded-compat | 26.6.6-r0 |