Advisories for Cargo/Kanidm package

The kanidmd web UI renders the WebAuthn passkey-registration challenge as raw JSON inside an inline <script id="data"> element using the Askama |safe filter. The challenge embeds the account's displayname, which serde_json serialises without escaping </>. A displayname containing </script> therefore terminates the script element early and injects arbitrary HTML into the credential-update page. Because the page is htmx-driven and the server's CSP allows 'unsafe-eval', injected hx-* attributes can issue authenticated …

The kanidmd OAuth2 token-exchange (/oauth2/token) and token-introspection (/oauth2/token/introspect) endpoints compare the supplied client_secret against the stored secret using Rust's PartialEq on String, which short-circuits on the first mismatching byte. This produces an observable timing discrepancy that varies with the length of the matching prefix.