CVE-2026-109954

Medium

Description

Parse Server 5.4.0 before 8.6.96 and 9.0.0 before 9.10.2-alpha.5 shares transactional batch state across concurrent requests, letting any client's transactional batch request interfere with other clients' database writes. On PostgreSQL or MongoDB replica sets and sharded clusters, other clients' acknowledged writes are rolled back if the batch fails, and PostgreSQL transactions can remain open indefinitely, causing subsequent writes to fail.

SeverityMedium

CVSS6.5

Exploit probability—

ProductParse-community Parse-server

PublishedOct 13, 2026

First seenOct 13, 2026

Weakness typeCWE-362Race condition

How to fix

Update

parse-community parse-server9.10.2-alpha.5, 8.6.96 or later

Vendor advisories

github.com/parse-community/parse-server/security/advisories/GHSA-jhh9-hrgh-c9gv

Affected products

Product	Affected versions	Fixed in
parse-community parse-server	9.0.0 ≤ v < 9.10.2-alpha.5, 5.4.0 ≤ v < 8.6.96	9.10.2-alpha.5, 8.6.96

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