CVE-2026-54432

EUVD-2026-43733
Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2 allows Stored Cross-Site Scripting (XSS). The issue occurs because the attachment MIME type is not properly escaped on the attachment-validation warning page.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
4.7 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 10.59%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
roundcubewebmail
1.6.0 ≤
𝑥
< 1.6.17
CNA
roundcubewebmail
1.7.0 ≤
𝑥
< 1.7.2
CNA
Debian logo
Debian Releases
Debian Product
Codename
roundcube
bookworm
vulnerable
bookworm (security)
1.6.5+dfsg-1+deb12u10
fixed
bullseye
vulnerable
bullseye (security)
1.4.15+dfsg.1-1+deb11u10
fixed
forky
1.6.18+dfsg-1
fixed
sid
1.6.18+dfsg-1
fixed
trixie
vulnerable
trixie (security)
1.6.17+dfsg-0+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
roundcube
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://roundcube.net/news/2026/07/05/security-updates-1.6.17-and-1.7.2