# CVE-2025-6226: IDOR in CreatePost API allows for timeboxed message disclosure

> CVE-2025-6226: IDOR in CreatePost API allows for timeboxed message disclosure. CVSS 6.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-6226
Last updated: 2026-06-17T10:01:25Z

- Published: 2025-07-18 08:48 UTC · Updated: 2026-06-17 10:01 UTC · Assigner: Mattermost
- CVSS: 6.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS: 0.37%, 31th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-306

## Description

Mattermost versions 10.5.x \<= 10.5.6, 10.8.x \<= 10.8.1, 10.7.x \<= 10.7.3, 9.11.x \<= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.

## 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-2025-6226)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-6226)
- [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-2025-6226 · Markdown: https://rewindex.com/cve/CVE-2025-6226.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-6226 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:16:22.058Z