What is CVE-2026-42558?

CVE-2026-42558 is a high-severity vulnerability in Xibosignage Xibo-cms, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2026-06-10.

How severe is CVE-2026-42558?

High severity. CVSS v3 base score is 7.6 out of 10.

XSS in Xibosignage Xibo-cms

CVE-2026-42558

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…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (1.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.

Affected products

Xibosignage Xibo-cms — versions < 4.4.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting
CWE-116 — Improper Encoding or Escaping of Output
CWE-346 — Origin Validation Error

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-42558?: CVE-2026-42558 is a high-severity vulnerability in Xibosignage Xibo-cms, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2026-06-10.
How severe is CVE-2026-42558?: High severity. CVSS v3 base score is 7.6 out of 10.