GHSA-q3p6-g7c4-829c BIT-parse-2026-34373 CVE-2026-34373

GraphQL API endpoint ignores CORS origin restriction

High npm

Severity: 0.0 / 10; High · CVSS 4.0
Exploit chance (EPSS): 0.21%; Chance of exploitation in the next 30 days. Higher than 10.55% of scored vulnerabilities.
Known exploited: No; Not in CISA's catalog
Weakness: CWE-346 Origin Validation Error
Fix: 9.7.0-alpha.10; Upgrade parse-server to this version or later

Description

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 versions

npm

Package	Vulnerable	Fixed in
parse-server	`>= 9.0.0, < 9.7.0-alpha.10`	`9.7.0-alpha.10`
parse-server	`>= 3.5.0, < 8.6.66`	`8.6.66`

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

parse-server npm → `9.7.0-alpha.10`

npm

npm install parse-server@9.7.0-alpha.10

yarn

yarn add parse-server@9.7.0-alpha.10

pnpm

pnpm add parse-server@9.7.0-alpha.10

Severity breakdown

CVSS 4.0 0.0

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

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: None
User interaction: Passive
Confidentiality (vulnerable system): None
Integrity (vulnerable system): None
Availability (vulnerable system): None
Confidentiality (subsequent systems): Low
Integrity (subsequent systems): None
Availability (subsequent systems): None

CVSS 3.1 8.8

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Weakness

CWE-346: Origin Validation Error

The product does not properly verify that the source of data or communication is valid.

References

Advisories

nvd.nist.gov/vuln/detail/CVE-2026-34373

Packages

github.com/parse-community/parse-server

Timeline

Mar 30, 2026 Published
Jul 24, 2026 Last updated by the source
Oct 31, 2026 Latest EPSS score

Advisory	Severity	Why it's related
GHSA-r899-h629-j84r Parse Server vulnerable to stored XSS via malformed Content-Type bypassing file upload extension blocklist	Low	Also affects parse-server
GHSA-97pr-9hgg-3p8r parse-server: LiveQuery discloses object data to a subscriber across an ACL read-access change	Low	Also affects parse-server
GHSA-v8x7-r927-cc93 parse-server: Stored XSS via non-standard file extension bypassing file upload extension blocklist	Low	Also affects parse-server
GHSA-cgxm-vr2f-6fj8 parse-server: Denial of service via exponential-time processing of deeply nested query operators	High	Also affects parse-server
GHSA-wmwx-jr2p-4j4r parse-server: Relation `$relatedTo` query bypasses `protectedFields` and owning-object ACL	Medium	Also affects parse-server
GHSA-75v4-m273-5j49 parse-server: Endpoints `/login` and `/verifyPassword` disclose MFA secrets and protected fields when `_User` get is denied	Medium	Also affects parse-server
GHSA-7wqv-xjf3-x35v parse-server: Stored XSS via trailing-dot filename bypassing file upload extension blocklist	Low	Also affects parse-server
GHSA-p84r-h6rx-f2xr parse-server: Server option routeAllowList is bypassable through batch sub-requests	Medium	Also affects parse-server

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