{"id":"GHSA-x274-8qfc-hrgf","summary":"Mattermost MS Teams plugin doesn't limit the request body size on the /lifecycle webhook endpoint ","details":"Mattermost Plugins versions \u003c=2.3.1 fail to limit the request body size on the {{/lifecycle}} webhook endpoint which allows an authenticated attacker to cause memory exhaustion and denial of service via sending an oversized JSON payload. Mattermost Advisory ID: MMSA-2026-00610.","aliases":["CVE-2026-21388","GO-2026-5734"],"modified":"2026-06-25T23:11:44.514940687Z","published":"2026-04-09T12:31:11Z","database_specific":{"cwe_ids":["CWE-770"],"severity":"LOW","github_reviewed":true,"github_reviewed_at":"2026-04-29T20:39:22Z","nvd_published_at":"2026-04-09T11:16:20Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21388"},{"type":"WEB","url":"https://github.com/mattermost/mattermost-plugin-msteams/commit/6fe4d295592ecc8767d67e69286cbeec01be3210"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost-plugin-msteams"},{"type":"WEB","url":"https://github.com/mattermost/mattermost-plugin-msteams/releases/tag/v2.3.2"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"affected":[{"package":{"name":"github.com/mattermost/mattermost-plugin-msteams","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-msteams"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.15.1-0.20260213190728-6fe4d295592e"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-x274-8qfc-hrgf/GHSA-x274-8qfc-hrgf.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}