High severity · published Mar 24, 2026
CVE-2026-33538
Parse Server: Denial of service via unindexed database query for unconfigured auth providers
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
parse-server · parse-community
< 8.6.58; >= 9.0.0, < 9.6.0-alpha.52 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33538
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33538
Patch
https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357
Patch
https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54
Issue Tracking
https://github.com/parse-community/parse-server/pull/10270
Issue Tracking
https://github.com/parse-community/parse-server/pull/10271
Vendor Advisory
https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr
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