# CVE-2026-3109: Missing timestamp validation in Zoom webhook handler

> CVE-2026-3109: Missing timestamp validation in Zoom webhook handler. CVSS 2.2 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-3109
Last updated: 2026-06-17T10:43:03Z

- Published: 2026-03-26 16:28 UTC · Updated: 2026-06-17 10:43 UTC · Assigner: Mattermost
- CVSS: 2.2 (CVSS 3.1) · Severity: Low · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
- EPSS: 0.30%, 23th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-754

## Description

Mattermost Plugins versions \<=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584

## 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-2026-3109)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-3109)
- [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-2026-3109 · Markdown: https://rewindex.com/cve/CVE-2026-3109.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-3109 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:50:28.863Z