CVE-2026-34373 Parse Server: GraphQL API endpoint ignores CORS origin restriction
Parse Server GraphQL endpoint ignores CORS origin restrictions, allowing unauthorized cross-origin requests when operators configure specific origin limits.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-34373?
CVE-2026-34373 is a medium-severity vulnerability in Parseplatform Parse-Server, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-346
Which versions are affected by CVE-2026-34373?
5 open source packages ship an affected version, including parse-server and parse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
parse-server npm | From 3.5.0 | 8.6.66 |
parse-server npm | From 3.5.0 | 8.6.66 |
parse-server npm | From 9.0.0 | 9.7.0-alpha.10 |
parse-server npm | From 9.0.0 | 9.7.0-alpha.10 |
parse Bitnami | All versions | 8.6.66, 9.7.0 |
Products include Parseplatform Parse-Server.
How do I fix CVE-2026-34373?
Upgrade parse-server to a fixed version for your release line: 8.6.66 or 9.7.0-alpha.10.
Is CVE-2026-34373 being exploited?
There is no known exploitation of CVE-2026-34373 in the wild and no public exploit code.
Other vulnerabilities in Parseplatform Parse-Server
- CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write
- CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection
- CVE-2022-24760 Command Injection in Parse server
- CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
- CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution
Sources
Also known as BIT-parse-2026-34373, GHSA-q3p6-g7c4-829c.