Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M
CVE-2026-33538Parse Server: Denial of service via unindexed database query for unconfigured auth providers
High 8.7
In plain English
A high-severity uncontrolled resource consumption 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 0.4% (higher than 37% 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 8.6.58 and 9.6.0-alpha.52, an unauthenticated attacker can cause denial of service by sending authentication requests with arbitrary, unconfigured provider names. The server executes a database query for each unconfigured provider before rejecting the request, and since no database index exists for unconfigured providers, each request triggers a full collection scan on the user database. This can be parallelized to saturate database resources. This issue has been patched in versions 8.6.58 and 9.6.0-alpha.52.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | parse-server | 9.6.0-alpha.52 | GHSA-g4cf-xj29-wqqr |
| npm | parse-server | 8.6.58 | GHSA-g4cf-xj29-wqqr |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | < 8.6.58>= 9.0.0, < 9.6.0-alpha.52 |
Weakness: CWE-400 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr x_refsource_CONFIRM
- https://github.com/parse-community/parse-server/pull/10270 x_refsource_MISC
- https://github.com/parse-community/parse-server/pull/10271 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54 x_refsource_MISC