CVE-2026-48846

Deferred Deferred - Pending Action

Remote Image Blocking Bypass in Roundcube Webmail

Publication date: 2026-05-25

Last updated on: 2026-05-25

Assigner: MITRE

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-25

Last Modified

2026-05-25

Generated

2026-07-06

AI Q&A

2026-05-26

EPSS Evaluated

2026-07-04

NVD

CVE-2026-48846

EUVD

EUVD-2026-31725

Affected Vendors & Products

Vendor	Product	Version / Range
roundcube	roundcube	to 1.6.16 (exc)
roundcube	roundcube	to 1.7.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-669	The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Roundcube Webmail versions 1.6.x before 1.6.16 and 1.7.x before 1.7.1. It allows an attacker to bypass the remote image blocking feature by using a specially crafted CSS var() value within an email message.

By exploiting this bypass, the attacker may cause information disclosure or bypass access controls intended to protect the user.

Impact Analysis

This vulnerability can lead to unauthorized information disclosure or access-control bypass when using affected versions of Roundcube Webmail.

An attacker could exploit this flaw to access information that should be blocked or restricted, potentially compromising user privacy and security.

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