CVE-2026-9793
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
W Keycloak znaleziono lukę, która pozwala na nieprawidłowe przetwarzanie niesygnowanych roszczeń w przypadku przesłania zaszyfrowanego obiektu żądania JSON Web Encryption (JWE). Może to prowadzić do obejścia skonfigurowanej polityki sygnatury i umożliwić zdalnemu atakującemu przesyłanie nieautoryzowanych roszczeń, co narusza integralność danych w procesie autoryzacji OpenID Connect (OIDC).
Risk Assessment
Luka ta stwarza ryzyko kompromitacji integralności danych w systemach korzystających z OIDC, co może prowadzić do poważnych naruszeń bezpieczeństwa. Mimo że lista dozwolonych URI przekierowań działa jako kontrola kompensacyjna, narusza ona wymagania dotyczące sygnatury OIDC Core i Financial-grade API (FAPI).
Recommendation
Zaleca się aktualizację Keycloak do najnowszej wersji, aby usunąć tę lukę oraz przegląd polityki sygnatury w celu zapewnienia zgodności z wymaganiami OIDC i FAPI. Dodatkowo, warto monitorować i audytować wszelkie roszczenia przesyłane przez systemy korzystające z OIDC.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

