Authorization Bypass Through User-Controlled Key Affecting parse-server package, versions <8.6.80>=9.0.0-alpha.1 <9.9.1-alpha.6
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published15 Jun 2026
- disclosed12 Jun 2026
- creditoffset
Introduced: 12 Jun 2026
NewCVE-2026-53726 (opens in a new tab)How to fix?
Upgrade parse-server to version 8.6.80, 9.9.1-alpha.6 or higher.
Overview
parse-server is a version of the Parse backend that can be deployed to any infrastructure that can run Node.js.
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via the reduceRelationKeys and authorizeRelatedToQuery paths in DatabaseController. An attacker can read related objects or probe relation membership by sending a $relatedTo query against a relation on an owning object they are not allowed to read, or against a relation field marked as protected. The vulnerable query path reads the relation join table before checking the owning object’s ACL, CLP, or protectedFields, so a caller can use $relatedTo to retrieve linked object IDs or infer whether a specific object is attached to a hidden relation. This exposes related records that should remain inaccessible and turns relation queries into a membership oracle for private parent objects.