# CVE-2025-8285: Unauthorized Channel Subscription Creation in Mattermost Confluence Plugin

> CVE-2025-8285: Unauthorized Channel Subscription Creation in Mattermost Confluence Plugin. CVSS 4.0 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-8285
Last updated: 2026-06-17T10:06:40Z

- Published: 2025-08-11 18:57 UTC · Updated: 2026-06-17 10:06 UTC · Assigner: Mattermost
- CVSS: 4.0 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
- EPSS: 0.20%, 9th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-862

## Description

Mattermost Confluence Plugin version \<1.5.0 fails to check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription endpoint.

## Affected vendors and products

- Mattermost: Mattermost Confluence Plugin

## Tracked companies

- [Mattermost](https://rewindex.com/company/mattermost.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-8285)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-8285)
- [https://mattermost.com/security-updates](https://mattermost.com/security-updates)

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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-2025-8285 · Markdown: https://rewindex.com/cve/CVE-2025-8285.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-8285 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:07.913Z