# CVE-2026-93847: Improper post type validation on scheduled post endpoints

> CVE-2026-93847: Improper post type validation on scheduled post endpoints. CVSS 3.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-93847
Last updated: 2026-11-02T20:18:05Z

- Published: 2026-10-26 14:15 UTC · Updated: 2026-11-02 20:18 UTC · Assigner: Mattermost
- CVSS: 3.5 (CVSS 3.1) · Severity: Low · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
- EPSS: 0.17%, 7th percentile (scored 2026-11-03)
- CISA KEV: no
- CWE: CWE-863

## Description

Mattermost versions 11.7.x \<= 11.7.10 fail to validate reserved system post types on the scheduled post creation and publication paths which allows an authenticated channel member to publish messages rendering as trusted system events via the scheduled post endpoint.. Mattermost Advisory ID: MMSA-2026-00732

## 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-2026-93847)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-93847)
- [https://mattermost.com/security-updates](https://mattermost.com/security-updates)

---

_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/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-93847 · Markdown: https://rewindex.com/cve/CVE-2026-93847.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-93847 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T15:55:21.147Z