CVE-2026-39321

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.8.0-alpha.6 and 8.6.74, he login endpoint response time differs measurably depending on whether the submitted username or email exists in the database. When a user is not found, the server responds immediately. When a user exists but the password is wrong, a bcrypt comparison runs first, adding significant latency. This timing difference allows an unauthenticated attacker to enumerate valid usernames. This vulnerability is fixed in 9.8.0-alpha.6 and 8.6.74.

References

• https://github.com/parse-community/parse-server/pull/10398
• https://github.com/parse-community/parse-server/pull/10399
• https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v