Stored XSS in Roundcube Webmail (CVE-2026-54433)

CVE-2026-54433 is a zero-click stored cross-site scripting (XSS) vulnerability in Roundcube Webmail's plain-text rendering component. The vulnerability was reported by Bohdan Kurinnoy of Samsung R&D Institute Ukraine (SRUKR) and is addressed in security updates released on 05 July 2026. Successful exploitation could allow an attacker to execute malicious scripts in a victim's browser without user interaction. Affected versions: - 1.6.x - 1.7.x We recommend updating to: 1.6.17, 1.7.2. CVSS 10.0 · our assessment: act_now Vendor advisory: https://roundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2 Details: https://vuln.today/cve/CVE-2026-54433