CVE-2026-42558Network attack vector

Stored XSS via sandbox-escaping DataSet messages

Published Jun 10, 2026 · Updated Jun 10, 2026

Stored XSS in Xibo CMS before 4.4.2 allows remote authenticated users to execute script in an authorized user's browser. The Data Connector accepts crafted DataSet messages whose stored script escapes the iframe sandbox when an authorized user processes the content. Exploitation requires DataSet permissions and the nonstandard privileges that permit independent DataSet creation.

CVSS severity7.6
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Xibo CMS before 4.4.2 allows remote authenticated users to execute script in an authorized user's browser. The Data Connector accepts crafted DataSet messages whose stored script escapes the iframe sandbox when an authorized user processes the content. Exploitation requires DataSet permissions and the nonstandard privileges that permit independent DataSet creation.

The record

CVE
CVE-2026-42558
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
Xibo Signage
Product
Xibo CMS
Classifications
CWE-116, CWE-346, CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Xibo Signage · Xibo CMSversion=< 4.4.2

Published CVSS scores

7.6GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-346Origin Validation Error
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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