# CVE-2025-13767: Unauthorized Read Access to Private Channel Posts via Mattermost Jira Plugin

> CVE-2025-13767: Unauthorized Read Access to Private Channel Posts via Mattermost Jira Plugin. CVSS 4.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-13767
Last updated: 2026-10-19T22:10:00Z

- Published: 2025-12-24 08:01 UTC · Updated: 2026-10-19 22:10 UTC · Assigner: Mattermost
- CVSS: 4.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- EPSS: 0.19%, 9th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-863

## Description

Mattermost versions 11.1.x \<= 11.1.0, 11.0.x \<= 11.0.5, 10.12.x \<= 10.12.3, 10.11.x \<= 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to.

## Affected vendors and products

- Mattermost: Mattermost

## Tracked companies

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

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-13767)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-13767)
- [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-2025-13767 · Markdown: https://rewindex.com/cve/CVE-2025-13767.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-13767 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:59.824Z