{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260423180926-c021eeaff8f0 or later.","affected":[{"fixed":"8.0.0-20260423180926-c021eeaff8f0","introduced":"8.0.0-20250731163400-5b955468ea1e"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2026-6961"],"ecosystem":"Go","epss":0.00452,"exploited":false,"fixed_versions":["8.0.0-20260423180926-c021eeaff8f0"],"ghsa_id":"GHSA-8qq9-cqj8-82w4","id":"tcs_01M5KGSWNKADZ94NK0V24FQV51","modified_at":"2026-08-26T01:21:40.813309354Z","published_at":"2026-08-25T19:43:10Z","references":["https://osv.dev/vulnerability/GO-2026-6281","https://github.com/advisories/GHSA-8qq9-cqj8-82w4","https://nvd.nist.gov/vuln/detail/CVE-2026-6961","https://github.com/mattermost/mattermost/commit/61d68d2d6ee81a5919597d91c736c502d7156859","https://github.com/mattermost/mattermost/commit/a0056ed68d95f64d7c4586985e7b7f16b96b3bec","https://github.com/mattermost/mattermost/commit/a9f3868e1eee9ec61855cd7277f39937385efffd","https://github.com/mattermost/mattermost/commit/c021eeaff8f003034ab40f82c552cc26a710a8fd","https://github.com/mattermost/mattermost/commit/c896a63dc44c2f9c081a0a15bfddc4e6eb50e753","https://github.com/mattermost/mattermost/pull/36223","https://github.com/mattermost/mattermost/pull/36251","https://github.com/mattermost/mattermost/pull/36252","https://github.com/mattermost/mattermost/pull/36253","https://github.com/mattermost/mattermost/pull/36255","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"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-6281#Go/github.com/mattermost/mattermost/server/v8","url":"https://osv.dev/vulnerability/GO-2026-6281"}],"summary":"Mattermost doesn't sanitize FileInfo.Name received from federated peers during shared channel file sync in github.com/mattermost/mattermost-server"}