{"id":"CVE-2023-1776","aliases":["BIT-mattermost-2023-1776","GHSA-63f2-6959-2pxj"],"url":"https://o3.security/vulnerability/CVE-2023-1776","summary":"Stored XSS via SVG attachment on Boards","details":"Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file. \n\n[Issue Identifier](https://mattermost.com/security-updates/): MMSA-2023-00139","published":"2023-03-31T11:29:36.185Z","modified":"2026-10-28T02:30:37.649281819Z","cvss":{"score":7.3,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N"},"epss":{"score":0.00447,"percentile":0.37352,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","fixedVersion":"7.1.6"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"7.7.2"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"7.1.6"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"7.8.1"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","fixedVersion":"7.1.6"},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","fixedVersion":"7.1.6"}],"fix":null,"references":[{"type":"WEB","url":"https://mattermost.com/security-updates/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1776.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1776"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost-server"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:37.649281819Z"}}