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.

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

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). 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
```
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

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