CVE-2026-33624: Parse Server: MFA recovery code single-use bypass via concurrent requests
(updated )
An attacker who obtains a user’s password and a single MFA recovery code can reuse that recovery code an unlimited number of times by sending concurrent login requests. This defeats the single-use design of recovery codes. The attack requires the user’s password, a valid recovery code, and the ability to send concurrent requests within milliseconds.
References
- github.com/advisories/GHSA-2299-ghjr-6vjp
- github.com/parse-community/parse-server
- github.com/parse-community/parse-server/commit/5e70094250a36bfcc14ecd49592be2b94fba66ff
- github.com/parse-community/parse-server/commit/fc3da35a81d5083b453e8967cabcc880f1a3bd0c
- github.com/parse-community/parse-server/pull/10275
- github.com/parse-community/parse-server/pull/10276
- github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp
- nvd.nist.gov/vuln/detail/CVE-2026-33624
Code Behaviors & Features
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