CVE-2026-48846

MEDIUM

Roundcube Webmail - Incorrect Resource Transfer Between Spheres

Title source: rule

Description

In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, the remote image blocking feature can be bypassed via a crafted CSS var() value in an e-mail message, which may lead to information disclosure or access-control bypass.

References (5)

Core 5

Core 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/59cca80908a61e662c5f81741449e9aeb91e8abe

View Patch ZIP pw:eip

https://github.com/roundcube/roundcubemail/releases/tag/1.6.16

https://github.com/roundcube/roundcubemail/commit/852350486b88b35b8544e8a630fad89e99e2150a

View Patch ZIP pw:eip

Scores

CVSS v3 6.5

EPSS 0.0030

EPSS Percentile 21.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-669

Status published

Products (2)

Roundcube/Webmail 1.6.0 - 1.6.16

Roundcube/Webmail 1.7.0 - 1.7.1

Published May 25, 2026

Tracked Since May 26, 2026