Vulnerability · Published May 25, 2026 · Assigned by mitre
CVE-2026-48843
High 7.2
In plain English
A high-severity server-side request forgery in Webmail from Roundcube. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | roundcube | 1.6.5+dfsg-1+deb12u9 | DEBIAN-CVE-2026-48843 |
| Debian:13 | roundcube | 1.6.16+dfsg-0+deb13u1 | DEBIAN-CVE-2026-48843 |
| Debian:14 | roundcube | 1.6.16+dfsg-1 | DEBIAN-CVE-2026-48843 |
| Ubuntu:25.10 | roundcube | no fix listed | UBUNTU-CVE-2026-48843 |
| Ubuntu:26.10 | roundcube | no fix listed | UBUNTU-CVE-2026-48843 |
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
References
- https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.1
- https://github.com/roundcube/roundcubemail/commit/ab96c88bfd888866ec5e02190b19618db283923a
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.16
- https://github.com/roundcube/roundcubemail/commit/cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1