MEDIUM 6.5
GHSA-5gmf-x7hg-97wf
Mattermost doesn't filter nil elements from outgoing webhook attachment payloads before processing
Details
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to filter nil elements from outgoing webhook attachment payloads before processing, which allows an authenticated user to cause a denial of service (server process termination) via a crafted webhook callback response containing a null attachment entry. Mattermost Advisory ID: MMSA-2026-00641
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Affected packages
Go / github.com/mattermost/mattermost-server
Introduced in:
11.6.0 Fixed in: 11.6.1 Fix
go get github.com/mattermost/mattermost-server@v11.6.1 Go / github.com/mattermost/mattermost-server
Introduced in:
11.5.0 Fixed in: 11.5.4 Fix
go get github.com/mattermost/mattermost-server@v11.5.4 Go / github.com/mattermost/mattermost-server
Introduced in:
11.4.0 Fixed in: 11.4.5 Fix
go get github.com/mattermost/mattermost-server@v11.4.5 Go / github.com/mattermost/mattermost-server
Introduced in:
10.11.0 Fixed in: 10.11.15 Fix
go get github.com/mattermost/mattermost-server@v10.11.15 Go / github.com/mattermost/mattermost/server/v8
Introduced in:
0 Fixed in: 8.0.0-20260407102538-faa7d75b4ea0 Fix
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260407102538-faa7d75b4ea0