# CVE-2026-34373: Parse Platform Parse Server origin validation bypass in GraphQL API

Source: https://junglewise.ai/threats/cve-2026-34373-parse-platform-parse-server-origin-validation-bypass-in-graphql  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-31. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-34373 · Severity: high · CVSS 8.8 · Published 2026-03-31

Parse Server is an open-source backend used to build and host applications. A security flaw in its GraphQL interface allows any website to make requests to the server, bypassing security rules intended to restrict access to trusted domains only. This could allow malicious websites to interact with your application's data if a user visits them while authenticated to your service.

Technologies: [parse-server (npm)](https://junglewise.ai/threats/technologies/parse-server). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-34373 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34373 being exploited in the wild.

**How severe is CVE-2026-34373?** High severity, with a CVSS score of 8.8, published 31 March 2026.

**Which products and versions are affected?** parse-server (npm) SEMVER:introduced=9.0.0,fixed=9.7.0-alpha.10.

**Is there a fix for CVE-2026-34373?** Yes. parse-server (npm): upgrade to 9.7.0-alpha.10 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-34373 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-34373?** Check whether you run parse-server (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- parse-server (npm): upgrade to 9.7.0-alpha.10 or later

  ```sh
  npm install parse-server@9.7.0-alpha.10
  ```


## Technical details

A Cross-Origin Resource Sharing (CORS) policy bypass exists in Parse Server's GraphQL API. While the REST API correctly enforces the 'allowOrigin' configuration, the GraphQL endpoint ignores this setting and unconditionally accepts requests from any origin. This vulnerability (CWE-346) allows an attacker to perform cross-origin requests that should have been blocked by the server's security policy. Exploitation typically requires a victim to visit a malicious site while having an active session with the Parse Server. The issue is fixed in versions 8.6.66 and 9.7.0-alpha.10.

## Affected products

- Parse Platform Parse Server >= 3.5.0, < 8.6.66; >= 9.0.0, < 9.7.0-alpha.10

## Identifiers

- CVE-2026-34373
- GHSA-q3p6-g7c4-829c

## Timeline

- 2026-03-31: disclosed
- 2026-03-31: advisory
- 2026-03-27: patched

## References

- [https://github.com/parse-community/parse-server/commit/0347641507891d0013ec57f7c10f012064f41263](https://github.com/parse-community/parse-server/commit/0347641507891d0013ec57f7c10f012064f41263)
- [https://github.com/parse-community/parse-server/commit/4dd0d3d8be1c39664c74ad10bb0abaa76bc41203](https://github.com/parse-community/parse-server/commit/4dd0d3d8be1c39664c74ad10bb0abaa76bc41203)
- [https://github.com/parse-community/parse-server/pull/10334](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/pull/10335)
- [https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c](https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c)

## Related threats

- [Duplicate Advisory: Parse Server vulnerable to stored XSS via malformed Content-Type bypassing file upload extension blocklist](https://junglewise.ai/threats/duplicate-advisory-parse-server-vulnerable-to-stored-xss-via-malformed-00d8867c)
- [Parse Server stored XSS via malformed Content-Type bypass](https://junglewise.ai/threats/cve-2026-61448-parse-server-stored-xss-via-malformed-content-type-bypass)
- [Parse Server information disclosure in LiveQuery ACL transitions](https://junglewise.ai/threats/cve-2026-57481-parse-server-information-disclosure-in-livequery-acl-transitions)
- [Parse Community Parse Server denial of service via nested query operators](https://junglewise.ai/threats/cve-2026-57480-parse-community-parse-server-denial-of-service-via-nested-query)
- [Parse Server stored XSS via file upload extension bypass](https://junglewise.ai/threats/cve-2026-55778-parse-server-stored-xss-via-file-upload-extension-bypass)