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CVE-20XX-?

CVE-2026-9602

6.5 MEDIUM 0.4% exploit odds Fix listed Denial of service Server

What it is

Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash the Mattermost Desktop App via changing the payload of a method to a malformed one. Mattermost Advisory ID: MMSA-2026-00678

At a glance

Exploitability: Can be exploited over the network with a low-privilege account. High risk of service disruption.
Exploit odds: 0.4% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-07-17 11:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-15 13:32 UTC Last updatedMost recent change to the record

Details

Published: 2026-07-17 11:17 UTC
Last modified: 2026-10-15 13:32 UTC
Exploit probability: 0.4% · EPSS, next 30 days
Weakness: CWE-400 · Uncontrolled resource consumption
Record status: Analyzed

Affected

Mattermost Desktop < 5.13.7
Mattermost Desktop ≤ 6.0.2
Mattermost Desktop < 6.2.1

Attack profile CVSS 3.1 · 6.5

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Meme: I wake up, CVE-2026-9602

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Fix and advisories

https://mattermost.com/security-updates

References

https://mattermost.com/security-updates

NVD record · CVE.org record