CVE-2026-34532

CRITICAL EPSS 19.4%
Published Mar 31, 20263mo ago · Modified Jun 17, 20261w ago
9.1 CVSS 4.0
Critical
Find Similar
Published Mar 31, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.67 and 9.7.0-alpha.11, an attacker can bypass Cloud Function validator access controls by appending "prototype.constructor" to the function name in the URL. When a Cloud Function handler is declared using the function keyword and its validator is a plain object or arrow function, the trigger store traversal resolves the handler through its own prototype chain while the validator store fails to mirror this traversal, causing all access control enforcement to be skipped. This allows unauthenticated callers to invoke Cloud Functions that are meant to be protected by validators such as requireUser, requireMaster, or custom validation logic. This issue has been patched in versions 8.6.67 and 9.7.0-alpha.11.

CVSS Details

Base Score
9.1
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
19.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-863 Incorrect Authorization Authorization

Affected Products 12

VendorProductVersionRange
parseplatformparse-server* <8.6.67
parseplatformparse-server*≥9.0.0  –  <9.7.0
parseplatformparse-server9.7.0any
parseplatformparse-server9.7.0any
parseplatformparse-server9.7.0any
parseplatformparse-server9.7.0any
parseplatformparse-server9.7.0any
parseplatformparse-server9.7.0any
parseplatformparse-server9.7.0any
parseplatformparse-server9.7.0any
parseplatformparse-server9.7.0any
parseplatformparse-server9.7.0any

References 5

  • github.com https://github.com/parse-community/parse-server/commit/4fc48cf28f22eea200d74d883505f485234a48d7
    Patch
  • github.com https://github.com/parse-community/parse-server/commit/dc59e272665644083c5b7f6862d88ce1ef0b2674
    Patch
  • github.com https://github.com/parse-community/parse-server/pull/10342
    Issue TrackingPatch
  • github.com https://github.com/parse-community/parse-server/pull/10343
    Issue TrackingPatch
  • github.com https://github.com/parse-community/parse-server/security/advisories/GHSA-vpj2-qq7w-5qq6
    MitigationPatchVendor Advisory

Remediation

  • github.com https://github.com/parse-community/parse-server/commit/4fc48cf28f22eea200d74d883505f485234a48d7
    Patch
  • github.com https://github.com/parse-community/parse-server/commit/dc59e272665644083c5b7f6862d88ce1ef0b2674
    Patch
  • github.com https://github.com/parse-community/parse-server/pull/10342
    Issue TrackingPatch
  • github.com https://github.com/parse-community/parse-server/pull/10343
    Issue TrackingPatch
  • github.com https://github.com/parse-community/parse-server/security/advisories/GHSA-vpj2-qq7w-5qq6
    MitigationPatchVendor Advisory