Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M
CVE-2026-33409Parse Server: Auth provider validation bypass on login via partial authData
High 7.0
In plain English
A high-severity improper authentication in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.52 and 9.6.0-alpha.41, an authentication bypass vulnerability allows an attacker to log in as any user who has linked a third-party authentication provider, without knowing the user's credentials. The attacker only needs to know the user's provider ID to gain full access to their account, including a valid session token. This affects Parse Server deployments where the server option allowExpiredAuthDataToken is set to true. The default value is false. This issue has been patched in versions 8.6.52 and 9.6.0-alpha.41.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | parse-server | 9.6.0-alpha.41 | GHSA-pfj7-wv7c-22pr |
| npm | parse-server | 8.6.52 | GHSA-pfj7-wv7c-22pr |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | < 8.6.52>= 9.0.0, < 9.6.0-alpha.41 |
Weakness: CWE-287 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-pfj7-wv7c-22pr x_refsource_CONFIRM
- https://github.com/parse-community/parse-server/pull/10246 x_refsource_MISC
- https://github.com/parse-community/parse-server/pull/10247 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/8d7df5639c4a35768fe8b78b4580b30e8a74721c x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/98f4ba5bcf2c199bfe6225f672e8edcd08ba732d x_refsource_MISC