{"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_01M5KFRD2JS28JJG2M14CJ4XAC","modified_at":"2026-06-25T23:11:44.514940687Z","published_at":"2026-04-09T12:31:11Z","references":["https://osv.dev/vulnerability/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","https://github.com/mattermost/mattermost-plugin-msteams/releases/tag/v2.3.2","https://mattermost.com/security-updates"],"severity":{"label":"low","score":3.7},"sources":[{"source":"osv","source_id":"GHSA-x274-8qfc-hrgf","url":"https://osv.dev/vulnerability/GHSA-x274-8qfc-hrgf"}],"summary":"Mattermost MS Teams plugin doesn't limit the request body size on the /lifecycle webhook endpoint"}