Information Disclosure Vulnerability in Roundcube Webmail by Roundcube
CVE-2026-48846

6.5MEDIUM

Key Information:

Vendor

Roundcube

Status
Webmail
Vendor
CVE Published:
25 May 2026

What is CVE-2026-48846?

In certain versions of Roundcube Webmail, a vulnerability exists that allows an attacker to bypass the remote image blocking feature by utilizing a specially crafted CSS var() value within an email. This security flaw can lead to unauthorized access to sensitive information, as it compromises the intended protective measures designed to shield users from potential threats embedded in remote images.

Affected Version(s)

Webmail 1.6.0 < 1.6.16

Webmail 1.7.0 < 1.7.1

References

https://roundcube.net/news/2026/05/24/security-updates-1....
https://github.com/roundcube/roundcubemail/releases/tag/1...
https://github.com/roundcube/roundcubemail/commit/59cca80...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.