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LOW · 2.2

CVE-2026-3109

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...

Vulnerability 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

CVSS Score

2.2

LOW

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW

Affected Products

VendorProductVersions
MattermostMattermost Server>= 10.11.0, < 10.11.12

Related Weaknesses (CWE)

CWE-754

References

FAQ

What is CVE-2026-3109?

CVE-2026-3109 is a vulnerability with a CVSS score of 2.2 (LOW). 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...

How severe is CVE-2026-3109?

CVE-2026-3109 has been rated LOW with a CVSS base score of 2.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-3109?

Check the references section above for vendor advisories and patch information. Affected products include: Mattermost Mattermost Server.