High severity · published Mar 31, 2026
CVE-2026-34373
Parse Server: GraphQL API endpoint ignores CORS origin restriction
8.8
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
parse-server · parse-community
< 8.6.66; >= 9.0.0, < 9.7.0-alpha.10 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34373
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34373
Patch
https://github.com/parse-community/parse-server/commit/0347641507891d0013ec57f7c10f012064f41263
Patch
https://github.com/parse-community/parse-server/commit/4dd0d3d8be1c39664c74ad10bb0abaa76bc41203
Issue Tracking
https://github.com/parse-community/parse-server/pull/10334
Issue Tracking
https://github.com/parse-community/parse-server/pull/10335
Patch
https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c
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