CVE-2026-34373

Name: CVE-2026-34373
Creator: NVD / NIST
Published: 2026-03-31T15:16:19.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.20%

Last modified Jun 17, 2026

CVE-2026-34373 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS 4.0

5.3/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.20%

10.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-346

Affected Software

Vendor	Product	Versions	Update
Parseplatform	Parse-Server	>= 3.5.0, < 8.6.66	—
Parseplatform	Parse-Server	>= 9.0.0, < 9.7.0	—
Parseplatform	Parse-Server	9.7.0	Alpha1

References

https://github.com/parse-community/parse-server/commit/0347641507891d0013ec57f7c10f012064f41263Patch
https://github.com/parse-community/parse-server/commit/4dd0d3d8be1c39664c74ad10bb0abaa76bc41203Patch
https://github.com/parse-community/parse-server/pull/10334Issue Tracking, Patch
https://github.com/parse-community/parse-server/pull/10335Issue Tracking, Patch
https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829cPatch, Vendor Advisory

Timeline

Published: Mar 31, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34373?

How severe is CVE-2026-34373?

CVE-2026-34373 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34373?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34373?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST