{"cve":"CVE-2023-47865","nvd":{"published":"2023-11-27T09:15:32.587","modified":"2026-06-17T06:33:26.127","status":"Modified","description":"Mattermost fails to check if hardened mode is enabled when overriding the username and/or the icon when posting a post. If settings allowed integrations to override the username and profile picture when posting, a member could also override the username and icon when making a post even if the Hardened Mode setting was enabled","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3},"cwes":["CWE-284"],"references":["https://mattermost.com/security-updates","https://mattermost.com/security-updates"],"products":["mattermost:mattermost"],"source":"nvd","synced_at":"2026-10-19T21:42:07.670898610+00:00"},"epss":{"cve":"CVE-2023-47865","score":0.00417,"percentile":0.35985,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jj46-9cgh-qmfx","url":"https://osv.dev/vulnerability/GHSA-jj46-9cgh-qmfx","summary":"Mattermost Improper Access Control vulnerability","modified":"2026-09-10T03:50:04.187881571Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":["<8.1.4"],"fixed":["8.1.4"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","ranges":["<7.8.13"],"fixed":["7.8.13"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}