{"action":"Upgrade github.com/mattermost/mattermost-server to 4.3.3+incompatible or later.","affected":[{"fixed":"4.3.3+incompatible","introduced":"0"},{"fixed":"4.4.3+incompatible","introduced":"4.4.0-rc1+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2017-18872"],"ecosystem":"Go","epss":0.00569,"exploited":false,"fixed_versions":["4.3.3+incompatible","4.4.3+incompatible"],"ghsa_id":"GHSA-hgrp-fgm8-56g8","id":"tcs_01M5KGBB0TNY0NCVDSPZC74271","modified_at":"2026-03-03T04:57:05.234972Z","published_at":"2025-10-30T15:02:33Z","references":["https://osv.dev/vulnerability/GO-2025-4075","https://github.com/advisories/GHSA-hgrp-fgm8-56g8","https://nvd.nist.gov/vuln/detail/CVE-2017-18872","http://github.com/mattermost/mattermost/commit/753386c2b2b06233d8bd977e3db29a4fe18098cb","https://github.com/mattermost/mattermost/commit/8f6bb1570dd234c63de5241eff9fbb268aad358c","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2025-4075","url":"https://osv.dev/vulnerability/GO-2025-4075"},{"source":"nvd","source_id":"CVE-2017-18872","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18872"}],"summary":"Mattermost Server's OAuth 2.0 service is vulnerable to attack through Missing Authorization in github.com/mattermost/mattermost-server"}