CVE-2026-114722

Name	CVE-2026-114722
Description	Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSS scoping bypass in HTML messages. rcube_utils::mod_css_styles() did not treat an at-rule prologue such as @layer a; as a selector boundary, and did not handle selectors beginning with ::, so selectors following an at-rule were left unscoped and applied to the whole Roundcube interface instead of being confined to the message body. This allows an HTML message to restyle application chrome for UI redressing and spoofing. Upstream fixed this in the commit “Fix CSS scoping bypass in HTML messages using at-rules”.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1151279

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
roundcube (PTS)	bookworm	1.6.5+dfsg-1+deb12u9	vulnerable
	bookworm (security)	1.6.5+dfsg-1+deb12u12	vulnerable
	trixie	1.6.18+dfsg-0+deb13u1	vulnerable
	trixie (security)	1.6.19+dfsg-0+deb13u1	vulnerable
	forky, sid	1.6.20+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
roundcube	source	(unstable)	1.6.20+dfsg-1			1151279

Notes

https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5
Fixed by: https://github.com/roundcube/roundcubemail/commit/ff9cf4a9bf3b7c66db9afe43fe5f1cc73b47ed35 (1.6.20)