CVE-2026-121415
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Parse Server MongoDB Field Type Validation Bypass via Null Dot Notation

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: VulnCheck

Description
Parse Server before 8.6.111 and 9.0.0 before 9.10.6-alpha.3 on MongoDB skips field type validation for null-valued dot notation keys, allowing sub-documents to be written beneath Pointer, Number, String, Date, or Boolean fields. Any client with write access, including unauthenticated clients where public writes are permitted, can corrupt field values, make objects unreadable via internal date fields, or break atomic operations on number fields.

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Meta Information

Published
2026-11-03
Last Modified
2026-11-03
Generated
2026-11-03
AI Q&A
2026-11-03
EPSS Evaluated
N/A
NVD
CVE-2026-121415
EUVD
EUVD-2026-115947

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
parse-community parse-server 9.0.0
parse-community parse-server 0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

Parse Server versions before 8.6.111 and 9.0.0 before 9.10.6-alpha.3 on MongoDB have a flaw where field type validation is skipped for null-valued dot notation keys. This allows attackers with write access to corrupt field values, make objects unreadable by targeting internal date fields, or disrupt atomic operations on number fields.

Impact Analysis

Unauthenticated or authorized users with write access can corrupt data, making objects unreadable or breaking operations. This could lead to data loss, application crashes, or unauthorized modifications if public writes are enabled.

Compliance Impact

This vulnerability could lead to data corruption or loss, violating integrity requirements in GDPR and HIPAA. Unauthorized modifications may also breach confidentiality or availability principles, potentially resulting in compliance violations.

Mitigation Strategies

Upgrade Parse Server to version 8.6.111 or later for the 8.x branch, or to 9.10.6-alpha.3 or later for the 9.x branch to address the field type validation issue.

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