CVE catalog
CVE-2026-35544
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via
- Severity
- Medium · CVSS 5.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.37% · Oct 27, 2026
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | roundcube | sid | 1.6.20+dfsg-1 | fixed |
| Debian | roundcube | forky | 1.6.20+dfsg-1 | fixed |
| Debian | roundcube | trixie | 1.6.18+dfsg-0+deb13u1 | fixed |
| Debian | roundcube | trixie-security | 1.6.20+dfsg-0+deb13u1 | fixed |
| Debian | roundcube | bookworm | 1.6.5+dfsg-1+deb12u9 | fixed |
| Debian | roundcube | bookworm-security | 1.6.5+dfsg-1+deb12u12 | fixed |
| Cpe | webmail | Not reported | Not reported | unknown |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | roundcube | source | sid | 1.6.14+dfsg-1 | not yet assigned | Not reported | [1131182] |
| Debian | roundcube | source | forky | 1.6.14+dfsg-1 | not yet assigned | Not reported | [1131182] |
| Debian | roundcube | source | trixie | 1.6.15+dfsg-0+deb13u1 | not yet assigned | Not reported | [1131182] |
| Debian | roundcube | source | bookworm | 1.6.5+dfsg-1+deb12u8 | not yet assigned | Not reported | [1131182] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [roundcube]Fixed
Details (4)
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- [roundcube-core]Fixed
Source package: [roundcube]
Details (4)
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- [roundcube-mysql]Fixed
Source package: [roundcube]
Details (4)
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- [roundcube-pgsql]Fixed
Source package: [roundcube]
Details (4)
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- [roundcube-plugins]Fixed
Source package: [roundcube]
Details (4)
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- [roundcube-sqlite3]Fixed
Source package: [roundcube]
Details (4)
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u9· all · bookwormFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
1.6.5+dfsg-1+deb12u11· all · bookworm-securityFixed · Fixed:
1.6.5+dfsg-1+deb12u8nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
[Debian 13 (Trixie)]
- [roundcube]Fixed
Details (7)
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.17+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.19+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.20+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
- [roundcube-core]Fixed
Source package: [roundcube]
Details (7)
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.17+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.19+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.20+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
- [roundcube-mysql]Fixed
Source package: [roundcube]
Details (7)
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.17+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.19+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.20+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
- [roundcube-pgsql]Fixed
Source package: [roundcube]
Details (7)
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.17+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.19+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.20+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
- [roundcube-plugins]Fixed
Source package: [roundcube]
Details (7)
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.17+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.19+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.20+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
- [roundcube-sqlite3]Fixed
Source package: [roundcube]
Details (7)
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.16+dfsg-0+deb13u1· all · trixieFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.17+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.18+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.19+dfsg-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
1.6.20+dfsg-0+deb13u1· all · trixie-securityFixed · Fixed:
1.6.15+dfsg-0+deb13u1nvd · roundcube · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-35544]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-35544]
- [https://security-tracker.debian.org/tracker/CVE-2026-35544]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35544.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0789.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]