CVE-2026-33624
Parse Server: MFA recovery code single-use bypass via concurrent requests
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.60 and 9.6.0-alpha.54, 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. This issue has been patched in versions 8.6.60 and 9.6.0-alpha.54.
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products
parse-community · parse-serverWant to know if your infrastructure is exposed to this?
Talk to TrueHacking →References
https://github.com/parse-community/parse-server/commit/5e70094250a36bfcc14ecd49592be2b94fba66ffhttps://github.com/parse-community/parse-server/commit/fc3da35a81d5083b453e8967cabcc880f1a3bd0chttps://github.com/parse-community/parse-server/pull/10275https://github.com/parse-community/parse-server/pull/10276https://github.com/parse-community/parse-server/security/advisories/GHSA-2299-ghjr-6vjp