CVE-2026-42558

Xibo Vulnerable to Stored XSS and Iframe Sandbox Escape via Data Connector Script in DataSet

State: Published
Severity: 7.6 High
Published: Jun 10, 2026
Updated: Jun 11, 2026
Reserved: Apr 28, 2026

Description

Xibo is an open source digital signage platform with a web content management system and Windows display player software. Prior to 4.4.2, a vulnerability chain consisting of Stored XSS and Iframe Sandbox escape in the Xibo CMS allows users with DataSet permissions to use the Data Connector functionality to craft messages which escape the sandbox and facilitate XSS. Exploitation of the vulnerability is possible on behalf of an authorized user who has both of the following privileges, which are not granted to non-admins as standard: Include "Add DataSet" button to allow for additional DataSets to be created independently to Layouts Users should upgrade to version 4.4.2 which fixes this issue. Upgrading to a fixed version is necessary to remediate. Users unable to upgrade should revoke such privileges from users they do not trust.

Scores

CVSS	Score	Vector	Source
3.1	7.6 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116 Improper Encoding or Escaping of Output
CWE-346 Origin Validation Error

Affected Products

Product	Versions
xibo-cmsxibosignage	< 4.4.2Affected

References

https://github.com/xibosignage/xibo-cms/security/advisories/GHSA-6389-j56c-9fww

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