Package Instance

Keycloak REST Services has a WebAuthn Attestation Statement Verification Bypass
A flaw was found in Keycloak’s WebAuthn registration component. This vulnerability allows an attacker to bypass the configured attestation policy and register untrusted or forged authenticators via submission of an attestation object with fmt: "none", even when the realm is configured to require direct attestation. This can lead to weakened authentication integrity and unauthorized authenticator registration.

Duplicate Advisory: Keycloak phishing attack via email verification step in first login flow
### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-xhpr-465j-7p9q. This link is maintained to preserve external references.

### Original Description
A flaw was found in Keycloak. When an authenticated attacker attempts to merge accounts with another existing account during an identity provider (IdP) login, the attacker will subsequently be prompted to "review profile" information. This vulnerability allows the attacker to modify their email address to match that of a victim's account, triggering a verification email sent to the victim's email address. The attacker's email address is not present in the verification email content, making it a potential phishing opportunity. If the victim clicks the verification link, the attacker can gain access to the victim's account.

Keycloak vulnerable to impersonation via logout token exchange
Keycloak was found to not properly enforce token types when validating signatures locally. An authenticated attacker could use this flaw to exchange a logout token for an access token and possibly gain access to data outside of enforced permissions.

Keycloak vulnerable to session takeovers due to reuse of session identifiers
A flaw was found in Keycloak. In Keycloak where a user can accidentally get access to another user's session if both use the same device and browser. This happens because Keycloak sometimes reuses session identifiers and doesn’t clean up properly during logout when browser cookies are missing. As a result, one user may receive tokens that belong to another user.

Keycloak Cross-site Scripting (XSS) via assertion consumer service URL in SAML POST-binding flow
Keycloak allows arbitrary URLs as SAML Assertion Consumer Service POST Binding URL (ACS), including JavaScript URIs (javascript:).

Allowing JavaScript URIs in combination with HTML forms leads to JavaScript evaluation in the context of the embedding origin on form submission.

Duplicate Advisory: Keycloak Open Redirect vulnerability
# Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-w8gr-xwp4-r9f7. This link is maintained to preserve external references.

# Original Description
A misconfiguration flaw was found in Keycloak. This issue can allow an attacker to redirect users to an arbitrary URL if a 'Valid Redirect URI' is set to http://localhost or http://127.0.0.1, enabling sensitive information such as authorization codes to be exposed to the attacker, potentially leading to session hijacking.