CVE-2026-48843

Name	CVE-2026-48843
Description	Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts. The issue stems from an insufficient fix for CVE-2026-35540.
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	1137507

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
roundcube (PTS)	bullseye	1.4.15+dfsg.1-1+deb11u4	vulnerable
	bullseye (security)	1.4.15+dfsg.1-1+deb11u8	vulnerable
	bookworm, bookworm (security)	1.6.5+dfsg-1+deb12u8	vulnerable
	trixie (security), trixie	1.6.15+dfsg-0+deb13u1	vulnerable
	sid	1.6.16+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)	1.6.16+dfsg-1			1137507

Notes

https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1
https://github.com/roundcube/roundcubemail/commit/cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1