AI description
Automated description summarized from trusted sources.
CVE-2026-42558 describes a vulnerability discovered in Xibo CMS, an open-source digital signage platform. The flaw originated as a Stored Cross-Site Scripting (XSS) vulnerability. This XSS was possible due to insufficient validation when a script was written to disk and a lack of escaping when the script was rendered in the browser. Although the initial XSS was contained within a sandboxed iframe, a researcher successfully escalated this into a full sandbox escape, creating an attack chain. The discovery involved extensive code review to understand the application's input and rendering processes.
- 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.
- Source
- security-advisories@github.com
- NVD status
- Deferred
CVSS 3.1
- Type
- Secondary
- Base score
- 7.6
- Impact score
- 4.7
- Exploitability score
- 2.3
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
- Severity
- HIGH
- security-advisories@github.com
- CWE-79
- Hype score
- Not currently trending