CVE-2026-86348

CVE-2026-86348 affects the MS Calendar plugin for Mattermost (versions ≤11.9, 11.0.9, 11.4.8, 11.7.7, and 10.22.11.0). The plugin fails to recover from handler panics triggered by a post-action request containing an unexpected field type , allowing an authenticated user to crash the plugin proces...

CVE-2026-86348 MS Calendar plugin: unrecovered handler panics from malformed post-action requests could crash the plugin process

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...

MS CALENDAR Cloud Service Detection

Binary data 8481.prm...