{"id":"GHSA-ffx7-34p2-vm3w","summary":"Mattermost Confluence plugin doesn't properly escape user-controlled display names in HTML template rendering","details":"Mattermost Confluence plugin version \u003c 1.7.0 fails to properly escape user-controlled display names in HTML template rendering which allows authenticated Confluence users with malicious display names to execute arbitrary JavaScript in victim browsers via sending a specially crafted OAuth2 connection link that, when visited, renders the attacker's display name without proper sanitization. Mattermost Advisory ID: MMSA-2025-00557","aliases":["CVE-2025-13523","GO-2026-4456"],"modified":"2026-02-19T20:56:12.370463Z","published":"2026-02-06T18:30:31Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-02-06T19:55:57Z","nvd_published_at":"2026-02-06T16:16:13Z","cwe_ids":["CWE-79"],"severity":"HIGH"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-13523"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost-plugin-confluence"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"affected":[{"package":{"name":"github.com/mattermost/mattermost-plugin-confluence","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-confluence"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.7.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-ffx7-34p2-vm3w/GHSA-ffx7-34p2-vm3w.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N"}]}