CVE-2026-65644: Rocketchat Unescaped Preview Html Injection

Unescaped user name concatenated into HTML message preview allows HTML injection and stored XSS (CVE-2026-65644).

Provally CuratedPublic repositoryMediumMedium confidenceVerifiedApache-2.0TS
greprules fetch cve-2026-65644-rocketchat-unescaped-preview-html-injection --engine opengrep

Description

Unescaped user name concatenated into HTML message preview allows HTML injection and stored XSS (CVE-2026-65644).