{"id":"GHSA-g78f-6xq7-rrhq","summary":"Mattermost Server allows attackers to gain privileges by accessing unintended API endpoints with users' credentials","details":"An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to gain privileges by accessing unintended API endpoints on a user's behalf.","aliases":["CVE-2017-18885","GO-2025-4200"],"modified":"2025-12-15T20:11:21.289667Z","published":"2022-05-24T17:21:04Z","database_specific":{"github_reviewed_at":"2025-12-05T21:47:57Z","nvd_published_at":"2020-06-19T19:15:00Z","cwe_ids":["CWE-269"],"severity":"CRITICAL","github_reviewed":true},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18885"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"affected":[{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.1.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-g78f-6xq7-rrhq/GHSA-g78f-6xq7-rrhq.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.2.0-rc1"},{"fixed":"4.2.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-g78f-6xq7-rrhq/GHSA-g78f-6xq7-rrhq.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.3.0-rc1"},{"fixed":"4.3.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-g78f-6xq7-rrhq/GHSA-g78f-6xq7-rrhq.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}