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Debian LTS Advisory DLA-4480-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Guilhem Moulin
February 17, 2026 https://wiki.debian.org/LTS
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Package : roundcube
Version : 1.4.15+dfsg.1-1+deb11u7
CVE ID : CVE-2026-25916 CVE-2026-26079
Debian Bug : 1127447
Vulnerabilities were discovered in Roundcube, a skinnable AJAX based
webmail solution for IMAP servers, which might lead to information
disclosure or privilege escalation.
CVE-2026-25916
NULL CATHEDRAL discovered that the HTML sanitizer doesn't treat SVG
`<feImage href="…">` as an image source. This allows attackers to
bypass remote image blocking to track email open action or
potentially bypass access control.
CVE-2026-26079
CERT Polska discovered that CSS code in text/html emails were
insufficiently sanitized, allowing an attacker to inject malicious
stylesheet rules.
For Debian 11 bullseye, these problems have been fixed in version
1.4.15+dfsg.1-1+deb11u7.
We recommend that you upgrade your roundcube packages.
For the detailed security status of roundcube please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/roundcube
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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