# CVE-2026-18690: Improper Authorization in MongoDB Server Allows Unauthorized Actions on System Collections

> CVE-2026-18690: Improper Authorization in MongoDB Server Allows Unauthorized Actions on System Collections. CVSS 8.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-18690
Last updated: 2026-10-23T21:10:00Z

- Published: 2026-08-11 18:47 UTC · Updated: 2026-10-23 21:10 UTC · Assigner: mongodb
- CVSS: 8.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- EPSS: 0.41%, 35th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-863

## 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 their assigned privileges should not permit. This could result in critical system collections being dropped and recreated without proper authorization.

## Affected vendors and products

- MongoDB: MongoDB Server

## Tracked companies

- [MongoDB Atlas](https://rewindex.com/company/mongodb-atlas.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-18690)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-18690)
- [https://jira.mongodb.org/browse/SERVER-130481](https://jira.mongodb.org/browse/SERVER-130481)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-18690 · Markdown: https://rewindex.com/cve/CVE-2026-18690.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-18690 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:20.251Z