Parse Server: MFA recovery code single-use bypass via concurrent requests

Description

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.

Recommendation

Update the parse-server package to the latest compatible version. Followings are version details:

• Affected version(s): **< 8.6.60

  >= 9.0.0, < 9.6.0-alpha.54**

• Patched version(s): **8.6.60

  9.6.0-alpha.54**

References

• GHSA-2299-ghjr-6vjp
• CVE-2026-33624
• CWE-367
• CAPEC-310
• OWASP 2021-A6

Related Issues

• Parse Server has a password reset token single-use bypass via concurrent requests - CVE-2026-32943
• Parse Server's MFA recovery codes not consumed after use - CVE-2026-31875
• Parse Server has a protected fields bypass via dot-notation in query and sort - CVE-2026-31872
• Parse Server has a stored XSS filter bypass via Content-Type MIME parameter and missing XML extension blocklist entries - CVE-2026-32728

Tags:

npm

parse-server