CVE-2026-18709

Missing Authorization in MongoDB Sharded Transaction Commit/Abort Handling Leads to Cross-Shard Data Inconsistency

State: Published
Severity: 5.9 Medium
Published: Aug 11, 2026
Updated: Aug 11, 2026
Reserved: Aug 3, 2026

Description

An issue in MongoDB Server could allow an authenticated user with direct network access to a shard to improperly commit or abort an in-progress prepared transaction, bypassing the intended transaction coordination process. This could result in cross-shard data inconsistency, cluster clock corruption, and violation of transaction atomicity guarantees.

Scores

CVSS	Score	Vector	Source
4.0	5.9 Medium	CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N	mongodb
3.1	6.4 Medium	CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H	mongodb

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
MongoDB ServerMongoDB	8.3.0 to before 8.3.8Affected 8.0 to before 8.0.29Affected 7.0 to before 7.0.40Affected

References

https://jira.mongodb.org/browse/SERVER-130544

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