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Medium severity · published Oct 13, 2026
CVE-2026-109954
Parse Server 9.0.0 before 9.10.2-alpha.5 Transactional Batch Request Write Interference
6.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
parse-server · parse-community
9.0.0 before 9.10.2-alpha.5; 5.4.0 before 8.6.96 · source: vendor
Affected product
PA
parse-server
parse-community
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109954
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109954
vendor-advisory
https://github.com/parse-community/parse-server/security/advisories/GHSA-jhh9-hrgh-c9gv
third-party-advisory
https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.2-alpha.5-transactional-batch-request-write-interference
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