{"action":"Upgrade github.com/mattermost/mattermost-plugin-msteams to 1.15.1-0.20260213190728-6fe4d295592e or later.","affected":[{"fixed":"1.15.1-0.20260213190728-6fe4d295592e","introduced":"0"}],"component":"github.com/mattermost/mattermost-plugin-msteams","cve_ids":["CVE-2026-21388"],"ecosystem":"Go","epss":0.00311,"exploited":false,"fixed_versions":["1.15.1-0.20260213190728-6fe4d295592e"],"ghsa_id":"GHSA-x274-8qfc-hrgf","id":"tcs_01M5KGPF73XFQK3CDTBW6BW477","modified_at":"2026-06-25T23:01:40.052056970Z","published_at":"2026-06-25T22:34:38Z","references":["https://osv.dev/vulnerability/GO-2026-5734","https://github.com/advisories/GHSA-x274-8qfc-hrgf","https://nvd.nist.gov/vuln/detail/CVE-2026-21388","https://github.com/mattermost/mattermost-plugin-msteams/commit/6fe4d295592ecc8767d67e69286cbeec01be3210","https://github.com/mattermost/mattermost-plugin-msteams/releases/tag/v2.3.2","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"GO-2026-5734","url":"https://osv.dev/vulnerability/GO-2026-5734"},{"source":"nvd","source_id":"CVE-2026-21388","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21388"}],"summary":"Mattermost MS Teams plugin doesn't limit the request body size on the /lifecycle webhook endpoint in github.com/mattermost/mattermost-plugin-msteams"}