CVE-2026-18709 PUBLISHED

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

Assigner: mongodb
Reserved: 03.08.2026 Published: 11.08.2026 Updated: 11.08.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 5.9

Product Status

Vendor MongoDB
Product MongoDB Server
Versions Default: unaffected
  • affected from 8.3.0 to 8.3.8 (excl.)
  • affected from 8.0 to 8.0.29 (excl.)
  • affected from 7.0 to 7.0.40 (excl.)

References

Problem Types

  • CWE-862: Missing Authorization CWE