CVE-2026-30966: Parseplatform Parse-server broken access control (CVSS 10.0)

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.7 and 8.6.20, Parse Server's internal tables, which store Relation field mappings such as role memberships, can be directly accessed via the REST API or GraphQL API by any client using only the application key. No master key is required. An attacker can create, read, update, or delete records in any internal relationship table. Exploiting this allows the attacker to inject themselves into any Parse Role, gaining all permissions associated with that role, including full read, write, and delete access to classes protected by role-based Class-Level Permissions (CLP). Similarly, writing to any such table that backs a Relation field used in a pointerFields CLP bypasses that access control. This vulnerability is fixed in 9.5.2-alpha.7 and 8.6.20.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L

Affected products

Parseplatform Parse-server9.5.2 · ≥ 9.0.0 < 9.5.2 · < 8.6.20

Remediation

Fixed in

Parseplatform Parse-server≥ 9.5.2

Patch & vendor advisories

https://github.com/parse-community/parse-server/security/advisories/GHSA-5f92-jrq3-28rc

References

https://github.com/parse-community/parse-server/releases/tag/8.6.20ProductRelease Notes
https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.7ProductRelease Notes
https://github.com/parse-community/parse-server/security/advisories/GHSA-5f92-jrq3-28rcPatchVendor Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-30966 being actively exploited?

CVE-2026-30966 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.54%.

How severe is CVE-2026-30966?

CVE-2026-30966 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.54% probability of exploitation.

Which products are affected by CVE-2026-30966?

Affected products include Parseplatform Parse-server.

How do I fix CVE-2026-30966?

Upgrade affected software to a fixed version, for example Parseplatform Parse-server 9.5.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-30966 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo