Medium
roundcube — security advisory
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.
- Products
- roundcube
- Affected versions
- 1.1.1+dfsg.1-2, 1.1.2+dfsg.1-5, 1.1.3+dfsg.1-1, 1.1.4+dfsg.1-1, 1.2~beta+dfsg.1-0ubuntu1, 1.2~beta+dfsg.1-0ubuntu1+esm1, 1.2~beta+dfsg.1-0ubuntu1+esm2, 1.2~beta+dfsg.1-0ubuntu1+esm3, 1.2~beta+dfsg.1-0ubuntu1+esm4, 1.2~beta+dfsg.1-0ubuntu1+esm5, 1.2~beta+dfsg.1-0ubuntu1+esm6, 1.2~beta+dfsg.1-0ubuntu1+esm7, 1.2~beta+dfsg.1-0ubuntu1+esm8, 1.3.0+dfsg.1-1, 1.3.1+dfsg.1-1, 1.3.10+dfsg.1-1, 1.3.3+dfsg.1-1, 1.3.3+dfsg.1-2, 1.3.6+dfsg.1-1, 1.3.6+dfsg.1-1ubuntu0.1~esm1, 1.3.6+dfsg.1-1ubuntu0.1~esm2, 1.3.6+dfsg.1-1ubuntu0.1~esm3, 1.3.6+dfsg.1-1ubuntu0.1~esm4, 1.3.6+dfsg.1-1ubuntu0.1~esm5, 1.3.6+dfsg.1-1ubuntu0.1~esm6, 1.3.6+dfsg.1-1ubuntu0.1~esm7, 1.3.6+dfsg.1-1ubuntu0.1~esm8, 1.3.8+dfsg.1-2, 1.4.1+dfsg.1-2, 1.4.11+dfsg.1-4, 1.4.2+dfsg.1-1, 1.4.2+dfsg.1-2, 1.4.3+dfsg.1-1, 1.4.3+dfsg.1-1ubuntu0.1~esm1, 1.4.3+dfsg.1-1ubuntu0.1~esm2, 1.4.3+dfsg.1-1ubuntu0.1~esm3, 1.4.3+dfsg.1-1ubuntu0.1~esm4, 1.4.3+dfsg.1-1ubuntu0.1~esm5, 1.4.3+dfsg.1-1ubuntu0.1~esm6, 1.4.3+dfsg.1-1ubuntu0.1~esm7, 1.4.3+dfsg.1-1ubuntu0.1~esm8, 1.5.0+dfsg.1-2, 1.5.0+dfsg.1-2ubuntu0.1~esm1, 1.5.0+dfsg.1-2ubuntu0.1~esm2, 1.5.0+dfsg.1-2ubuntu0.1~esm3, 1.5.0+dfsg.1-2ubuntu0.1~esm4, 1.5.0+dfsg.1-2ubuntu0.1~esm5, 1.5.0+dfsg.1-2ubuntu0.1~esm6, 1.6.10+dfsg-1, 1.6.10+dfsg-2, 1.6.11+dfsg-1, 1.6.11+dfsg-1ubuntu0.26.04.1~esm1, 1.6.2+dfsg-1, 1.6.4+dfsg-1, 1.6.5+dfsg-1, 1.6.6+dfsg-1, 1.6.6+dfsg-2, 1.6.6+dfsg-2ubuntu0.1, 1.6.6+dfsg-2ubuntu0.1+esm1, 1.6.6+dfsg-2ubuntu0.1+esm2, 1.6.6+dfsg-2ubuntu0.1+esm3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-35544
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:33 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-35544
roundcube
Fixed versions: Not specified
roundcube
Fixed versions: Not specified
roundcube
Fixed versions: Not specified
roundcube
Fixed versions: Not specified
roundcube
Fixed versions: Not specified
roundcube
Fixed versions: Not specified
roundcube
Fixed versions: Not specified
roundcube
Fixed versions: Not specified
Complete source record
{
"id": "49d4ba9feebeb6e84a9952c044d8200c6948aea3df9cc4932e6ef592a591e652",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-35544",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-35544",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-35544",
"products": [
{
"name": {
"value": "roundcube",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.1.1+dfsg.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.2+dfsg.1-5",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.3+dfsg.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.1.4+dfsg.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2~beta+dfsg.1-0ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2~beta+dfsg.1-0ubuntu1+esm1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2~beta+dfsg.1-0ubuntu1+esm2",
"evidence": "/affected/0/versions"
},
{
"value": "1.2~beta+dfsg.1-0ubuntu1+esm3",
"evidence": "/affected/0/versions"
},
{
"value": "1.2~beta+dfsg.1-0ubuntu1+esm4",
"evidence": "/affected/0/versions"
},
{
"value": "1.2~beta+dfsg.1-0ubuntu1+esm5",
"evidence": "/affected/0/versions"
},
{
"value": "1.2~beta+dfsg.1-0ubuntu1+esm6",
"evidence": "/affected/0/versions"
},
{
"value": "1.2~beta+dfsg.1-0ubuntu1+esm7",
"evidence": "/affected/0/versions"
},
{
"value": "1.2~beta+dfsg.1-0ubuntu1+esm8",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "roundcube",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.0+dfsg.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.1+dfsg.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.3+dfsg.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.3+dfsg.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+dfsg.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+dfsg.1-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+dfsg.1-1ubuntu0.1~esm2",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+dfsg.1-1ubuntu0.1~esm3",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+dfsg.1-1ubuntu0.1~esm4",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+dfsg.1-1ubuntu0.1~esm5",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+dfsg.1-1ubuntu0.1~esm6",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+dfsg.1-1ubuntu0.1~esm7",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.6+dfsg.1-1ubuntu0.1~esm8",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "roundcube",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.8+dfsg.1-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.3.10+dfsg.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.1+dfsg.1-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.2+dfsg.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.2+dfsg.1-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3+dfsg.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3+dfsg.1-1ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3+dfsg.1-1ubuntu0.1~esm2",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3+dfsg.1-1ubuntu0.1~esm3",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3+dfsg.1-1ubuntu0.1~esm4",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3+dfsg.1-1ubuntu0.1~esm5",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3+dfsg.1-1ubuntu0.1~esm6",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3+dfsg.1-1ubuntu0.1~esm7",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3+dfsg.1-1ubuntu0.1~esm8",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "roundcube",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.11+dfsg.1-4",
"evidence": "/affected/3/versions"
},
{
"value": "1.5.0+dfsg.1-2",
"evidence": "/affected/3/versions"
},
{
"value": "1.5.0+dfsg.1-2ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
},
{
"value": "1.5.0+dfsg.1-2ubuntu0.1~esm2",
"evidence": "/affected/3/versions"
},
{
"value": "1.5.0+dfsg.1-2ubuntu0.1~esm3",
"evidence": "/affected/3/versions"
},
{
"value": "1.5.0+dfsg.1-2ubuntu0.1~esm4",
"evidence": "/affected/3/versions"
},
{
"value": "1.5.0+dfsg.1-2ubuntu0.1~esm5",
"evidence": "/affected/3/versions"
},
{
"value": "1.5.0+dfsg.1-2ubuntu0.1~esm6",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "roundcube",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.6.2+dfsg-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.6.4+dfsg-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.6.5+dfsg-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.6.6+dfsg-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.6.6+dfsg-2",
"evidence": "/affected/4/versions"
},
{
"value": "1.6.6+dfsg-2ubuntu0.1",
"evidence": "/affected/4/versions"
},
{
"value": "1.6.6+dfsg-2ubuntu0.1+esm1",
"evidence": "/affected/4/versions"
},
{
"value": "1.6.6+dfsg-2ubuntu0.1+esm2",
"evidence": "/affected/4/versions"
},
{
"value": "1.6.6+dfsg-2ubuntu0.1+esm3",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "roundcube",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.6.10+dfsg-1",
"evidence": "/affected/5/versions"
},
{
"value": "1.6.10+dfsg-2",
"evidence": "/affected/5/versions"
},
{
"value": "1.6.11+dfsg-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "roundcube",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.6.11+dfsg-1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "roundcube",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.6.11+dfsg-1",
"evidence": "/affected/7/versions"
},
{
"value": "1.6.11+dfsg-1ubuntu0.26.04.1~esm1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-35544",
"aliases": [
"UBUNTU-CVE-2026-35544"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "roundcube",
"purl": "pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1.1.1+dfsg.1-2",
"1.1.2+dfsg.1-5",
"1.1.3+dfsg.1-1",
"1.1.4+dfsg.1-1",
"1.2~beta+dfsg.1-0ubuntu1",
"1.2~beta+dfsg.1-0ubuntu1+esm1",
"1.2~beta+dfsg.1-0ubuntu1+esm2",
"1.2~beta+dfsg.1-0ubuntu1+esm3",
"1.2~beta+dfsg.1-0ubuntu1+esm4",
"1.2~beta+dfsg.1-0ubuntu1+esm5",
"1.2~beta+dfsg.1-0ubuntu1+esm6",
"1.2~beta+dfsg.1-0ubuntu1+esm7",
"1.2~beta+dfsg.1-0ubuntu1+esm8"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35544.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "roundcube",
"binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
},
{
"binary_name": "roundcube-core",
"binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
},
{
"binary_name": "roundcube-mysql",
"binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
},
{
"binary_name": "roundcube-pgsql",
"binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
},
{
"binary_name": "roundcube-plugins",
"binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
},
{
"binary_name": "roundcube-sqlite3",
"binary_version": "1.2~beta+dfsg.1-0ubuntu1+esm8"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "roundcube",
"purl": "pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1.3.0+dfsg.1-1",
"1.3.1+dfsg.1-1",
"1.3.3+dfsg.1-1",
"1.3.3+dfsg.1-2",
"1.3.6+dfsg.1-1",
"1.3.6+dfsg.1-1ubuntu0.1~esm1",
"1.3.6+dfsg.1-1ubuntu0.1~esm2",
"1.3.6+dfsg.1-1ubuntu0.1~esm3",
"1.3.6+dfsg.1-1ubuntu0.1~esm4",
"1.3.6+dfsg.1-1ubuntu0.1~esm5",
"1.3.6+dfsg.1-1ubuntu0.1~esm6",
"1.3.6+dfsg.1-1ubuntu0.1~esm7",
"1.3.6+dfsg.1-1ubuntu0.1~esm8"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35544.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "roundcube",
"binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-core",
"binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-mysql",
"binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-pgsql",
"binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-plugins",
"binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-sqlite3",
"binary_version": "1.3.6+dfsg.1-1ubuntu0.1~esm8"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "roundcube",
"purl": "pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"1.3.8+dfsg.1-2",
"1.3.10+dfsg.1-1",
"1.4.1+dfsg.1-2",
"1.4.2+dfsg.1-1",
"1.4.2+dfsg.1-2",
"1.4.3+dfsg.1-1",
"1.4.3+dfsg.1-1ubuntu0.1~esm1",
"1.4.3+dfsg.1-1ubuntu0.1~esm2",
"1.4.3+dfsg.1-1ubuntu0.1~esm3",
"1.4.3+dfsg.1-1ubuntu0.1~esm4",
"1.4.3+dfsg.1-1ubuntu0.1~esm5",
"1.4.3+dfsg.1-1ubuntu0.1~esm6",
"1.4.3+dfsg.1-1ubuntu0.1~esm7",
"1.4.3+dfsg.1-1ubuntu0.1~esm8"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35544.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "roundcube",
"binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-core",
"binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-mysql",
"binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-pgsql",
"binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-plugins",
"binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
},
{
"binary_name": "roundcube-sqlite3",
"binary_version": "1.4.3+dfsg.1-1ubuntu0.1~esm8"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "roundcube",
"purl": "pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"1.4.11+dfsg.1-4",
"1.5.0+dfsg.1-2",
"1.5.0+dfsg.1-2ubuntu0.1~esm1",
"1.5.0+dfsg.1-2ubuntu0.1~esm2",
"1.5.0+dfsg.1-2ubuntu0.1~esm3",
"1.5.0+dfsg.1-2ubuntu0.1~esm4",
"1.5.0+dfsg.1-2ubuntu0.1~esm5",
"1.5.0+dfsg.1-2ubuntu0.1~esm6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35544.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "roundcube",
"binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
},
{
"binary_name": "roundcube-core",
"binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
},
{
"binary_name": "roundcube-mysql",
"binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
},
{
"binary_name": "roundcube-pgsql",
"binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
},
{
"binary_name": "roundcube-plugins",
"binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
},
{
"binary_name": "roundcube-sqlite3",
"binary_version": "1.5.0+dfsg.1-2ubuntu0.1~esm6"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "roundcube",
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],
"modified": "2026-10-17T12:55:43.543655769Z",
"provider": "osv",
"upstream": [
"CVE-2026-35544"
],
"references": [
"https://ubuntu.com/security/CVE-2026-35544",
"https://www.cve.org/CVERecord?id=CVE-2026-35544",
"https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14",
"https://nullcathedral.com/posts/2026-03-18-roundcube-round-two-three-more-sanitizer-bypasses/#css-position-fixed-important",
"https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662",
"https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0",
"https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7",
"https://github.com/roundcube/roundcubemail/releases/tag/1.5.14",
"https://github.com/roundcube/roundcubemail/releases/tag/1.6.14",
"https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5"
]
},
"related_cves": [
{
"value": "CVE-2026-35544",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 353993,
"published_at": "2026-04-03T05:16:00+00:00"
}