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CVE-2026-34373
March 30, 2026
Impact 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. Patches The GraphQL API endpoint now uses the same CORS middleware as the REST API, ensuring the "allowOrigin" and "allowHeaders" server options are consistently enforced across all endpoints. Workarounds There is no known workaround other than upgrading. Resources - GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c - Fix Parse Server 9: https://github.com/parse-community/parse-server/pull/10334 - Fix Parse Server 8: https://github.com/parse-community/parse-server/pull/10335
Affected Packages
https://github.com/parse-community/parse-server.git (GITHUB):
Affected version(s) >=9.0.0 <9.7.0-alpha.10
Fix Suggestion:
Update to version 9.7.0-alpha.10
https://github.com/parse-community/parse-server.git (GITHUB):
Affected version(s) >=2.0.0 <8.6.66
Fix Suggestion:
Update to version 8.6.66
parse-server (NPM):
Affected version(s) >=3.5.0 <8.6.66
Fix Suggestion:
Update to version 8.6.66
parse-server (NPM):
Affected version(s) >=9.0.0 <9.7.0-alpha.10
Fix Suggestion:
Update to version 9.7.0-alpha.10
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CVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.7
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Origin Validation Error