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GHSA-jpq4-7fmq-q5fj

LowCVSS 2.1 / 10
Published May 5, 2026·Last modified May 5, 2026
Affected Components(0)

No affected components available

Description

Impact

A race condition in the MFA SMS one-time password (OTP) login path allows two concurrent /login requests carrying the same OTP to both succeed and both receive valid session tokens, breaking the single-use property of the OTP. The vulnerability requires the attacker to already possess the victim's password and intercept the active SMS OTP (e.g. via SIM swap, network mirror, or phishing relay) and to race the legitimate login request, so the practical attack surface is narrow.

This advisory is the same class of incomplete fix as GHSA-2299-ghjr-6vjp (TOTP recovery codes) and GHSA-w73w-g5xw-rwhf (MFA recovery in authData-only login). Those previous fixes added optimistic locking only for array-typed authData fields; SMS MFA stores the OTP as a string, so the guard skipped it.

Patches

The optimistic lock has been generalized to cover primitive (string, number, boolean) and array authData fields. The lock is implemented as a shared helper applyAuthDataOptimisticLock that adds equality predicates on the original values of changed fields to the update WHERE clause. Concurrent writers racing the same single-use token now miss the WHERE condition and surface as Invalid auth data.

Workarounds

  • Disable SMS MFA and use TOTP instead (TOTP tokens are time-window validated, not stored single-use).
  • Place a rate limiter on the /login endpoint to reduce concurrent-request burst capacity.

Resources

  • GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-jpq4-7fmq-q5fj
  • Fix Parse Server 9: https://github.com/parse-community/parse-server/pull/10448
  • Fix Parse Server 8: https://github.com/parse-community/parse-server/pull/10449
Risk Scores
Base Score
2.1

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
0.5

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
0.24%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Low severity
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