Xibo CMS Stored XSS and Iframe Sandbox Escape Vulnerability
CVE-2026-42558

7.6HIGH

Key Information:

Vendor

Xibosignage

Status
Xibo-cms
Vendor
CVE Published:
10 June 2026

What is CVE-2026-42558?

The Xibo CMS, an open-source digital signage platform, has a vulnerability that allows users with specific DataSet permissions to exploit a combination of Stored XSS and an Iframe Sandbox escape. This flaw enables these authorized users to craft malicious messages using the Data Connector functionality, which can lead to unauthorized actions. It is crucial for users with privileges allowing the creation of DataSets to upgrade to version 4.4.2, which resolves this issue effectively. For those unable to upgrade, it is recommended to restrict trust levels by revoking certain user permissions to mitigate potential risks.

Affected Version(s)

xibo-cms < 4.4.2

References

https://github.com/xibosignage/xibo-cms/security/advisori...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.6
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.