CVE-2026-3109 — Missing timestamp validation in Zoom webhook handler

CVE-2026-3109

Missing timestamp validation in Zoom webhook handler PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 0 through 10.11.11; unaffected 11.5.0; unaffected 10.11.12

CWE

CWE-754

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.