EUVD-2026-51483

A flaw was found in the secure-client-uris client policy executor within Keycloak core services. This component is responsible for enforcing security requirements on client configurations, such as requiring encrypted connections for redirect URIs. Due to an improper check that only looks at the...

Improper Verification of Cryptographic Signature

Overview org.keycloak:keycloak-core is an open source identity and access management solution. Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JWT Authorization Grant flow due to algorithm confusion in signature verification. An attacke...

keycloak-core: mTLS passthrough

A vulnerability was found in Keycloak. Deployments of Keycloak with a reverse proxy not using pass-through termination of TLS, with mTLS enabled, are affected. This issue may allow an attacker on the local network to authenticate as any user or client that leverages mTLS as the authentication...

keycloak-core: Open Redirect on Account page

An open redirect vulnerability was found in Keycloak. A specially crafted URL can be constructed where the referrer and referreruri parameters are made to trick a user to visit a malicious webpage. A trusted URL can trick users and automation into believing that the URL is safe, when, in fact, it...

Credential Leakage

org.keycloak, keycloak-core is vulnerable to Credential Leakage. The vulnerability is due to a lack of proper validation and enforcement when administrators change the LDAP Connection URL without requiring re-entry of the currently configured LDAP bind credentials. The vulnerability allows an...

GHSA-9VM7-V8WJ-3FQW keycloak-core: open redirect via "form_post.jwt" JARM response mode

An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "formpost.jwt". It is observed that changing the responsemode parameter in the original proof of concept from "formpost" to "formpost.jwt...

CVE-2023-6920

An incomplete fix was found in the Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "formpost.jwt". Changing the responsemode parameter in the original proof of concept from "formpost" to "formpost.jwt" can bypass the...

Cross-Site Scripting (XSS)

Keycloak Core is vulnerable to reflected cross-site scripting. The vulnerability exists via the POST http requests due to lack of escaping which allows a malicious attacker to inject and execute arbitrary javascript...

Insecure Session Management

keycloak-core uses an insecure session management. The application does not require re-authentication upon a successful password change. in the event where an existing session can be obtained by an attacker, a password change will not cause the attacker's session to be invalidated...

Cross-site Scripting (XSS)

keycloak-core is vulnerable to cross-site scripting XSS. The vulnerability exists as the external applications Application Links used in the admin console are not validated...

GHSA-959Q-32G8-VVP7 Moderate severity vulnerability that affects org.keycloak:keycloak-core

It was found that keycloak before 3.4.2 final would permit misuse of a client-side /etc/hosts entry to spoof a URL in a password reset request. An attacker could use this flaw to craft a malicious password reset request and gain a valid reset token, leading to information disclosure or further...

GHSA-C77R-6F64-478Q keycloak-core discloses system properties

It was found that while parsing the SAML messages the StaxParserUtil class of keycloak before 2.5.1 replaces special strings for obtaining attribute values with system property. This could allow an attacker to determine values of system properties at the attacked system by formatting the SAML...

Improper Authentication in org.keycloak:keycloak-core

It was found that the keycloak before 2.3.0 did not implement authentication flow correctly. An attacker could use this flaw to construct a phishing URL, from which he could hijack the user's session. This could lead to information disclosure, or permit further possible attacks...

GHSA-QGM9-232X-HWPX Moderate severity vulnerability that affects org.keycloak:keycloak-core

Withdrawn: Duplicate of CVE-2017-12161 / GHSA-959q-32g8-vvp7...

Timing Attacks

keycloak-core is vulnerable to timing attacks. The vulnerability is possible because the HMAC signature comparison algorithm used by its JWS token code is not performed in constant time. Therefore, an attacker can trigger a timing attack through the JWS tokens...