fix(security): require authentication for the credential check endpoint - #323
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hirokiterashima merged 1 commit intoSep 16, 2026
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The endpoint that verifies a username and password was reachable without authentication and returned the account's id and real name for any valid username, letting an anonymous caller brute-force passwords and harvest user ids and real names by probing usernames. Require an authenticated user, and only return the account id and name after the correct password has been supplied. The team sign-in flow, the only caller, already runs in an authenticated session and reads those fields only after a successful check.
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Sep 16, 2026
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Apologies for taking so long to review this. It looks good. Helps prevent malicious users. Thanks for making this PR.
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Summary
The credential check endpoint required no authentication and always returned the account id and real name for any valid username, even when the password was wrong. This let anyone harvest user ids and real names by probing usernames. This requires authentication and only returns the identity fields once the correct password has been provided.
Changes
@Secured("ROLE_USER")to the credential check method.userId,username,firstNameandlastNamein the response when the password is valid.Testing
mvnw package).