What is CVE-2026-18709?

CVE-2026-18709 is a medium-severity vulnerability in Mongodb Server, classified under Missing Authorization. CVSS score: 6.4/10. Published 2026-08-11.

How severe is CVE-2026-18709?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Auth bypass in Mongodb Server

CVE-2026-18709

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 resul…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H.

Affected products

Mongodb Server — versions 8.3.0, 8.0, 7.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

cna@mongodb.com

Frequently asked questions

What is CVE-2026-18709?: CVE-2026-18709 is a medium-severity vulnerability in Mongodb Server, classified under Missing Authorization. CVSS score: 6.4/10. Published 2026-08-11.
How severe is CVE-2026-18709?: Medium severity. CVSS v3 base score is 6.4 out of 10.