CVE-2026-33421
Vulnerability Scoring
Analysis In Progress
CVE-2026-33421 Vulnerability Analysis & Exploit Details
CVE-2026-33421
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-33421 Details
Status: Received on 24 Mar 2026, 19:16 UTC
Published on: 24 Mar 2026, 19:16 UTC
CVSS Release:
CVE-2026-33421 Vulnerability Summary
CVE-2026-33421: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.53 and 9.6.0-alpha.42, Parse Server's LiveQuery WebSocket interface does not enforce Class-Level Permission (CLP) pointer permissions (readUserFields and pointerFields). Any authenticated user can subscribe to LiveQuery events and receive real-time updates for all objects in classes protected by pointer permissions, regardless of whether the pointer fields on those objects point to the subscribing user. This bypasses the intended read access control, allowing unauthorized access to potentially sensitive data that is correctly restricted via the REST API. This issue has been patched in versions 8.6.53 and 9.6.0-alpha.42.
Assessing the Risk of CVE-2026-33421
Access Complexity Graph
The exploitability of CVE-2026-33421 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2026-33421
No exploitability data is available for CVE-2026-33421.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2026-33421, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2026-33421, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-33421 does not compromise confidentiality.
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Integrity:
None
CVE-2026-33421 does not impact data integrity.
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Availability:
None
CVE-2026-33421 does not affect system availability.
CVE-2026-33421 References
External References
- https://github.com/parse-community/parse-server/commit/6c3317aca6eb618ac48f999021ae3ef7766ad1ea
- https://github.com/parse-community/parse-server/commit/976dad109f3fe3fbd0a3a35ef62e7a5d35eb0bee
- https://github.com/parse-community/parse-server/pull/10250
- https://github.com/parse-community/parse-server/pull/10252
- https://github.com/parse-community/parse-server/security/advisories/GHSA-fph2-r4qg-9576
CWE Common Weakness Enumeration
CWE-863Protect Your Infrastructure against CVE-2026-33421: Combat Critical CVE Threats
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