{"id":"CVE-2023-6459","aliases":["GHSA-63cv-4pc2-4fcf","BIT-mattermost-2023-6459"],"title":"Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability","summary":"Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","vendor":"mattermost","product":"github.com/mattermost/mattermost-server/v6","ecosystem":"go","affected":["github.com/mattermost/mattermost-server/v6 < 7.8.14","github.com/mattermost/mattermost/server/v8 < 8.1.5"],"patched":["github.com/mattermost/mattermost-server/v6 7.8.14","github.com/mattermost/mattermost/server/v8 8.1.5"],"published":"2023-12-06","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:49:59.493388426Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-63cv-4pc2-4fcf","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-6459"},{"url":"https://github.com/mattermost/mattermost"},{"url":"https://mattermost.com/security-updates"}],"tags":["osv","go"],"epss":0.00534,"epssPercentile":0.44006,"ingestedAt":"2026-09-12T03:13:01.757Z","slug":"CVE-2023-6459","body":"## Overview\n\nMattermost is grouping calls in the /metrics endpoint by id and reports that id in the response. Since this id is the channelID, the public /metrics endpoint is revealing channelIDs.\n\n\n\n## Affected packages\n\n- `github.com/mattermost/mattermost-server/v6 < 7.8.14`\n- `github.com/mattermost/mattermost/server/v8 < 8.1.5`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/mattermost/mattermost-server/v6 7.8.14`\n- `github.com/mattermost/mattermost/server/v8 8.1.5`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}