Vulnerability in Parse-Community Parse-Server
CVE-2026-109954
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/parse-community/parse-server/security/advisories/GHSA-jhh9-hrgh-c9gv (vendor-advisory)
- www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.2-alpha.5-transacti… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109954?
- CVE-2026-109954 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.5/10. Published 2026-10-13.
- How severe is CVE-2026-109954?
- Medium severity. CVSS v3 base score is 6.5 out of 10.