CVE-2026-4915 | Mattermost up to 10.11.14/11.4.4/11.5.3/11.6.0 Webhook Attachment unusual condition (EUVD-2026-31646)

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A vulnerability was found in Mattermost up to 10.11.14/11.4.4/11.5.3/11.6.0. It has been declared as problematic. Affected by this issue is some unknown functionality of the component Webhook Attachment Handler. Executing a manipulation can lead to improper check for unusual conditions.

This vulnerability is handled as CVE-2026-4915. The attack can be executed remotely. There is not any exploit available.

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