Vulnerability · Published Mar 18, 2026 · Assigned by GitHub_M

CVE-2026-33042Parse Server affected by empty authData bypassing credential requirement on signup

Medium 6.9

In plain English

A medium-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 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.3%top 75.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.29 and 8.6.49, a user can sign up without providing credentials by sending an empty `authData` object, bypassing the username and password requirement. This allows the creation of authenticated sessions without proper credentials, even when anonymous users are disabled. The fix in 9.6.0-alpha.29 and 8.6.49 ensures that empty or non-actionable `authData` is treated the same as absent `authData` for the purpose of credential validation on new user creation. Username and password are now required when no valid auth provider data is present. As a workaround, use a Cloud Code `beforeSave` trigger on the `_User` class to reject signups where `authData` is empty and no username/password is provided.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	parse-server	9.6.0-alpha.29	GHSA-wjqw-r9x4-j59v
npm	parse-server	8.6.49	GHSA-wjqw-r9x4-j59v

Affected products (as reported)

Vendor	Product	Versions
parse-community	parse-server	>= 9.0.0, < 9.6.0-alpha.29< 8.6.49

Weakness: CWE-287 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-wjqw-r9x4-j59v x_refsource_CONFIRM
https://github.com/parse-community/parse-server/pull/10219 x_refsource_MISC
https://github.com/parse-community/parse-server/pull/10220 x_refsource_MISC