{"action":"Upgrade github.com/mattermost/mattermost-server to 4.3.3 or later.","affected":[{"fixed":"4.3.3","introduced":"0"},{"fixed":"4.4.3","introduced":"4.4.0-rc1"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18872"],"ecosystem":"Go","epss":0.00569,"exploited":false,"fixed_versions":["4.3.3","4.4.3"],"ghsa_id":"GHSA-hgrp-fgm8-56g8","id":"tcs_01M5KFCJ0YXVSTC8T408P5QTPJ","modified_at":"2025-11-05T19:57:43.428437Z","published_at":"2022-05-24T17:21:02Z","references":["https://osv.dev/vulnerability/GHSA-hgrp-fgm8-56g8","https://nvd.nist.gov/vuln/detail/CVE-2017-18872","https://github.com/mattermost/mattermost/commit/8f6bb1570dd234c63de5241eff9fbb268aad358c","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates","http://github.com/mattermost/mattermost/commit/753386c2b2b06233d8bd977e3db29a4fe18098cb"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-hgrp-fgm8-56g8","url":"https://osv.dev/vulnerability/GHSA-hgrp-fgm8-56g8"}],"summary":"Mattermost Server's OAuth 2.0 service is vulnerable to attack through Missing Authorization"}