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.
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Meta Information
Published
2026-05-25
Last Modified
2026-05-25
Generated
2026-06-15
AI Q&A
2026-05-26
EPSS Evaluated
2026-06-14
NVD
CVE-2026-48846
EUVD
EUVD-2026-31725
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
roundcube roundcube to 1.6.16 (exc)
roundcube roundcube to 1.7.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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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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