The verification of the second factor was not subject to rate limiting. The absence of rate limiting on the second factor endpoint allows an attacker with valid credentials to automate OTP guessing.
This issue has been addressed in Weblate 5.12 via https://github.com/WeblateOrg/weblate/pull/14918.
Thanks to obscuredeer for reporting this issue at HackerOne.
{ "cwe_ids": [ "CWE-307" ], "nvd_published_at": "2025-06-16T21:15:24Z", "github_reviewed_at": "2025-06-16T14:52:53Z", "github_reviewed": true, "severity": "MODERATE" }