GHSA-6r2j-cxgf-495f

Source

https://github.com/advisories/GHSA-6r2j-cxgf-495f

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-6r2j-cxgf-495f/GHSA-6r2j-cxgf-495f.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-6r2j-cxgf-495f

Aliases

Published

2026-03-11T00:20:38Z

Modified

2026-03-14T03:41:04.557395Z

Severity

9.9 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N CVSS Calculator

Summary

Parse Server vulnerable to session token exfiltration via `redirectClassNameForKey` query parameter

Details

Impact

A vulnerability in Parse Server's query handling allows an authenticated or unauthenticated attacker to exfiltrate session tokens of other users by exploiting the redirectClassNameForKey query parameter. Exfiltrated session tokens can be used to take over user accounts.

The vulnerability requires the attacker to be able to create or update an object with a new relation field, which depends on the Class-Level Permissions of at least one class.

Patches

The fix applies the same security checks that normally protect class access after the query redirect, ensuring that queries redirected via redirectClassNameForKey are subject to the same restrictions as direct queries to the target class.

Workarounds

Set restrictive Class-Level Permissions to prevent clients from creating new fields on classes, specifically by disabling addField for public access and unauthenticated users. Note that this limits client functionality and does not fully eliminate the risk if a relation field pointing to a protected class already exists in the schema.

References

GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-6r2j-cxgf-495f
Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.8
Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.21

Database specific

{
    "severity": "CRITICAL",
    "cwe_ids": [
        "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-11T00:20:38Z",
    "nvd_published_at": "2026-03-10T21:16:48Z"
}

References

Affected packages

npm / parse-server

Package

Name: parse-server; View open source insights on deps.dev
Purl: pkg:npm/parse-server

Affected ranges

Type: SEMVER
Events: Introduced

9.0.0-alpha.1

Fixed

9.5.2-alpha.8

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-6r2j-cxgf-495f/GHSA-6r2j-cxgf-495f.json"

npm / parse-server

Package

Name: parse-server; View open source insights on deps.dev
Purl: pkg:npm/parse-server

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

8.6.21

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-6r2j-cxgf-495f/GHSA-6r2j-cxgf-495f.json"