CVE-2026-10556 | Mattermost up to 10.11.22/11.7.7/11.8.4/11.9.0 Calendar Plugin input validation

A vulnerability, which was classified as problematic, has been found in Mattermost up to 10.11.22/11.7.7/11.8.4/11.9.0. The impacted element is an unknown function of the component Calendar Plugin. Performing a manipulation results in improper input validation.

This vulnerability is cataloged as CVE-2026-10556. It is possible to initiate the attack remotely. There is no exploit available.

It is advisable to upgrade the affected component.VulDB Recent EntriesRead More