Keycloak: xss via assertion consumer service url in saml post-binding flow

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

A flaw was found in the SAML client registration in Keycloak that could allow an administrator to register malicious JavaScript URIs as Assertion Consumer Service POST Binding URLs (ACS), posing a Cross-Site Scripting (XSS) risk. This issue may allow a malicious admin in one realm or a client with registration access to target users in different realms or applications, executing arbitrary JavaScript in their contexts upon form submission. This can enable unauthorized access and harmful actions, compromising the confidentiality, integrity, and availability of the complete KC instance.

Source published

25 Apr 2024 16:02:03 UTC

Source modified

27 Oct 2026 04:28:46 UTC

Observed here

27 Oct 2026 06:22:56 UTC

Source terms

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CVSS 3.1 · 6.0 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L