CVE-2026-121415

Low

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.

SeverityLow

CVSS3.7

Exploit probability—

ProductParse-community Parse-server

PublishedNov 3, 2026

First seenNov 4, 2026

Weakness typeCWE-20Improper input validation

How to fix

Update

parse-community parse-server9.10.6-alpha.3, 8.6.111 or later

Patches

Vendor advisories

github.com/parse-community/parse-server/security/advisories/GHSA-655c-2xf3-77x9

Affected products

Product	Affected versions	Fixed in
parse-community parse-server	9.0.0 ≤ v < 9.10.6-alpha.3, v < 8.6.111	9.10.6-alpha.3, 8.6.111

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