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PatchSiren cyber security CVE debrief

CVE-2026-42558 xibosignage CVE debrief

CVE-2026-42558 is a vulnerability in the Xibo digital signage platform, which allows users with DataSet permissions to craft malicious messages via the Data Connector functionality. This vulnerability, with a CVSS score of 7.6, was published on 2026-06-10T23:16:46.263Z and modified on 2026-06-11T15:30:51.693Z. The vulnerability is a combination of Stored XSS and Iframe Sandbox escape, enabling attackers to execute malicious scripts and escape the sandbox. To remediate, users should upgrade to version 4.4.2 of Xibo.

Vendor
xibosignage
Product
xibo-cms
CVSS
HIGH 7.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Users of Xibo digital signage platform, especially those with DataSet permissions, should be aware of this vulnerability and take necessary actions to remediate.

Technical summary

The vulnerability is caused by a combination of Stored XSS and Iframe Sandbox escape in the Xibo CMS. Users with DataSet permissions can use the Data Connector functionality to craft messages that escape the sandbox and facilitate XSS.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to version 4.4.2 of Xibo to fix the vulnerability.
  • Revoke DataSet permissions from untrusted users.

Evidence notes

The vulnerability is confirmed by the CVE record [cve-org] and detailed in the NVD [nvd].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42558 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42558

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42558 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42558

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.