{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.17 or later.","affected":[{"fixed":"11.6.1","introduced":"11.6.0"},{"fixed":"11.5.5","introduced":"11.5.0"},{"fixed":"10.11.17","introduced":"10.11.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-6961"],"ecosystem":"Go","epss":0.00305,"exploited":false,"fixed_versions":["11.6.1","11.5.5","10.11.17"],"ghsa_id":"GHSA-8qq9-cqj8-82w4","id":"tcs_01M5KF469B8PV77BXRR8J6VWF4","modified_at":"2026-08-26T01:21:46.735481545Z","published_at":"2026-06-12T18:31:59Z","references":["https://osv.dev/vulnerability/GHSA-8qq9-cqj8-82w4","https://nvd.nist.gov/vuln/detail/CVE-2026-6961","https://github.com/mattermost/mattermost/pull/36255","https://github.com/mattermost/mattermost/pull/36253","https://github.com/mattermost/mattermost/pull/36252","https://github.com/mattermost/mattermost/pull/36251","https://github.com/mattermost/mattermost/pull/36223","https://github.com/mattermost/mattermost/commit/c896a63dc44c2f9c081a0a15bfddc4e6eb50e753","https://github.com/mattermost/mattermost/commit/c021eeaff8f003034ab40f82c552cc26a710a8fd","https://github.com/mattermost/mattermost/commit/a9f3868e1eee9ec61855cd7277f39937385efffd","https://github.com/mattermost/mattermost/commit/a0056ed68d95f64d7c4586985e7b7f16b96b3bec","https://github.com/mattermost/mattermost/commit/61d68d2d6ee81a5919597d91c736c502d7156859","https://github.com/mattermost/mattermost/releases/tag/v10.11.16","https://github.com/mattermost/mattermost/releases/tag/v11.5.5","https://github.com/mattermost/mattermost/releases/tag/v11.6.2","https://github.com/mattermost/mattermost/releases/tag/v11.7.0","https://mattermost.com/security-updates","https://github.com/mattermost/mattermost"],"severity":{"label":"high","score":7.6},"sources":[{"source":"osv","source_id":"GHSA-8qq9-cqj8-82w4","url":"https://osv.dev/vulnerability/GHSA-8qq9-cqj8-82w4"}],"summary":"Mattermost doesn't sanitize FileInfo.Name received from federated peers during shared channel file sync"}