What’s Vulnerable › Vulnerabilities

CVE-2026-116801: Parse Server 9.0.0 before 9.10.5-alpha.6 ACL Bypass via $relatedTo Query

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-27
• Weakness: CWE-943

Description

Parse Server before 8.6.105 and 9.0.0 before 9.10.5-alpha.6 does not validate the owning object reference in $relatedTo relation queries, so supplying a query operator instead of an object ID bypasses the owning-object ACL check. A client with read access to at least one object of the owning class can disclose which readable objects are linked to owning objects it cannot read.

Affected products

• parse-community parse-server: from 9.0.0 before 9.10.5-alpha.6 — fixed in 9.10.5-alpha.6

How to fix

Upgrade to a fixed version: parse-community parse-server 9.10.5-alpha.6. Check the vendor advisory for mitigations.

References

• https://github.com/parse-community/parse-server/security/advisories/GHSA-58m4-cqvw-4vgh
• https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.5-alpha.6-acl-bypass-via-relatedto-query

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