CVE-2026-18698

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

State: Published
Severity: 5.3 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 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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N	mongodb
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N	mongodb

Weaknesses

CWE-863 Incorrect 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-130481

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