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CVE-2026-34532 parse-community CVE debrief

CVE-2026-34532 is a critical vulnerability in Parse Server, an open-source backend that can be deployed to any infrastructure running Node.js. The vulnerability allows an attacker to bypass Cloud Function validator access controls by appending 'prototype.constructor' to the function name in the URL. This issue affects Parse Server versions prior to 8.6.67 and 9.7.0-alpha.11. The vulnerability has been patched in versions 8.6.67 and 9.7.0-alpha.11. Organizations should prioritize patching to prevent unauthorized access to Cloud Functions.

Vendor
parse-community
Product
parse-server
CVSS
CRITICAL 9.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-31
Original CVE updated
2026-07-24
Advisory published
2026-03-31
Advisory updated
2026-07-24

Who should care

Organizations using Parse Server, especially those with publicly exposed instances, should prioritize patching to prevent unauthorized access to Cloud Functions. This involves reviewing current deployments, identifying instances that may be vulnerable, and applying patches or mitigations as necessary. Additionally, defenders should verify the patch status of their Parse Server deployments and review access controls for Cloud Functions to ensure that they are properly configured.

Technical summary

The vulnerability arises from how Parse Server resolves Cloud Function handlers through their prototype chain while failing to mirror this traversal in the validator store. This discrepancy allows unauthenticated callers to invoke Cloud Functions meant to be protected by validators such as requireUser, requireMaster, or custom validation logic. The issue affects Parse Server versions prior to 8.6.67 and 9.7.0-alpha.11, and has been patched in these versions. Defenders should focus on patching and verifying access controls for Cloud Functions.

Defensive priority

High

Recommended defensive actions

  • Apply patches: Upgrade to Parse Server version 8.6.67 or 9.7.0-alpha.11.
  • Inventory and patch management: Ensure all instances of Parse Server are identified and patched.
  • Monitoring: Implement monitoring to detect potential exploitation attempts.
  • Exception tracking: Track exceptions related to Cloud Function invocations.
  • Compensating controls: Consider implementing additional access controls or Web Application Firewalls (WAFs) to detect and prevent exploitation.

Evidence notes

The CVE record was published on 2026-03-31T15:16:20.010Z and last modified on 2026-07-24T20:10:00.147Z. The NVD entry is currently Analyzed. Evidence from the CVE record and NVD entry indicates that Parse Server versions prior to 8.6.67 and 9.7.0-alpha.11 are affected. Defenders should verify the patch status of their Parse Server deployments and review access controls for Cloud Functions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-34532 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-34532

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-34532 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-34532

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.