GHSA-37j9-56gh-j2r7High· 7.3▾ TwilightDuplicate Advisory: Keycloak vulnerable to cross-site scripting (xss) via case-insensitive uri validation bypass
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 40.2 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
Last analysed / modified upstream
This advisory has been withdrawn because it is a duplicate of GHSA-v3f7-2p4r-mwfw. This link is maintained to preserve external references.
A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with manage-client permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive javascript: or data: scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.
org.keycloak:keycloak-services < 26.6.4Refer to the advisory for the patched release.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-9086High· 7.3Keycloak vulnerable to cross-site scripting (xss) via case-insensitive uri validation bypass
CVE-2026-9799Medium· 4.6Keycloak allows unauthorized access to resources via uma permission ticket bypass
GHSA-7pm9-g8jh-3m74Medium· 4.9Duplicate Advisory: Keycloak vulnerable to information disclosure through arbitrary filesystem path probing
CVE-2026-9083Medium· 4.9Keycloak vulnerable to information disclosure through arbitrary filesystem path probing
CVE-2026-9705Medium· 6.5Keycloak: Attacker can re-enable and take over disabled clients via registration access token
GHSA-q929-g23j-2rc7Medium· 6.5Duplicate Advisory: Keycloak: Attacker can re-enable and take over disabled clients via registration access token