Description
In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, an unsanitized subject field in the draft restored value could lead to stored XSS/HTML/CSS injection on shared mailboxes.
References5
- github.com/roundcube/roundcubemail/commit/189d30a4890319cd687df…
- github.com/roundcube/roundcubemail/commit/a21519187873ce962db02…
- github.com/roundcube/roundcubemail/releases/tag/1.6.16
- github.com/roundcube/roundcubemail/releases/tag/1.7.1
- roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1
Metrics
- CVSS 3.1
-
4.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 15 · as of 14 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.