High severity · published May 25, 2026
CVE-2026-48843
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…
7.2
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
Webmail · Roundcube
1.6.14 before 1.6.16; 1.7.0 before 1.7.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48843
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-48843
github.com
https://github.com/roundcube/roundcubemail/commit/ab96c88bfd888866ec5e02190b19618db283923a
github.com
https://github.com/roundcube/roundcubemail/commit/cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1
github.com
https://github.com/roundcube/roundcubemail/releases/tag/1.6.16
github.com
https://github.com/roundcube/roundcubemail/releases/tag/1.7.1
roundcube.net
https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1
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