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CVE-20XX-?

CVE-2026-86348

4.3 MEDIUM 0.4% exploit odds Fix listed Denial of service Web app

What it is

Mattermost versions <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701

At a glance

Exploitability: Can be exploited over the network with a low-privilege account. Limited direct impact.
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

2026-09-14 14:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-14 19:28 UTC Last updatedMost recent change to the record

Details

Published: 2026-09-14 14:17 UTC
Last modified: 2026-10-14 19:28 UTC
Exploit probability: 0.4% · EPSS, next 30 days
Weakness: CWE-704
Record status: Analyzed

Affected

Mattermost Server < 10.11.23
Mattermost Server < 11.7.8
Mattermost Server < 11.8.5
Mattermost Server < 11.9.1

Attack profile CVSS 3.1 · 4.3

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

Raw vector

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

Meme: I wake up, CVE-2026-86348

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Fix and advisories

https://mattermost.com/security-updates

References

https://mattermost.com/security-updates

NVD record · CVE.org record