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Fencer Vulns
critical 10.0

CVE-2026-30966 json

Parse Server role escalation and CLP bypass via direct `_Join` table write

published 2026-03-10 8 mo ago modified 2026-09-08 2 mo ago also BIT-parse-2026-30966 , EUVD-2026-10882 , GHSA-5f92-jrq3-28rc

cvss
10.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm parse-server 8.6.20, 9.5.2-alpha.7
  • bitnami parse 8.6.20, 9.5.2
  • parseplatform parse-server 8.6.20, 9.5.2-alpha.7
  • parseplatform parse_server 8.6.20, 9.5.2-alpha.7

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
7 mo ago

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
GitHub 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
OSV 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L

Affected packages

ecosystem package affected fixed in
npm parse-server
>=9.0.0-alpha.1, <9.5.2-alpha.7
<8.6.20
9.5.2-alpha.7
8.6.20
bitnami parse
<8.6.20
>=9.0.0, <9.5.2
8.6.20
9.5.2

Affected products

  • parse-community parse-server

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.