CVE-2026-86348
MS Calendar plugin: unrecovered handler panics from malformed post-action requests could crash the plugin process
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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
| CWE | CWE-704 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Sep 14, 2026 |
| Last Updated | Sep 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
Mattermost / Mattermost
<=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 ≤ <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0
Credits
alimursaliyev