CVE-2026-86348
Last modified
CVE-2026-86348 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.
Description
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
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost Server | >= 10.11.0, < 10.11.23 |
| Mattermost | Mattermost Server | >= 11.7.0, < 11.7.8 |
| Mattermost | Mattermost Server | >= 11.8.0, < 11.8.5 |
| Mattermost | Mattermost Server | >= 11.9.0, < 11.9.1 |
References
- https://mattermost.com/security-updatesVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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