CVE-2026-18698

Improper Authorization in MongoDB Server Allows Unauthorized Actions on System Collections via the validate Command

CVE-2026-18698 is fixed in MongoDB on 1 platform by MongoDB 8.3.11 (version 8.3.11), released September 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.3

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0024

15th percentile

An issue in MongoDB Server could allow an authenticated user with a limited database-scoped role to perform an action against protected system collections that should require more specific privileges. This could result in exposure of collection metadata and, on certain deployment configurations, unauthorized modification of system collection data.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
MongoDB	8.3.11	MongoDB 8.3.11	Sep 9, 2026

Details

Published
August 11, 2026
Weakness
CWE-863: Incorrect Authorization
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-18698

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