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CVE-2026-42558— Xibo Vulnerable to Stored XSS and Iframe Sandbox Escape via Data Connector Script in DataSet

CVSS 7.6 · High EPSS 0.11% · P2

Affected Version Matrix 1

VendorProductVersion RangeStatus
xibosignagexibo-cms< 4.4.2affected
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I. Basic Information for CVE-2026-42558

Vulnerability Information
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Vulnerability Title
Xibo Vulnerable to Stored XSS and Iframe Sandbox Escape via Data Connector Script in DataSet
Source: NVD (National Vulnerability Database)
Vulnerability 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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Xibo 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xibo是Dan Garner个人开发者的一款数字标牌内容管理工具。 Xibo 4.4.2之前版本存在跨站脚本漏洞，该漏洞源于存储型XSS和Iframe沙箱逃逸链，可能导致具有DataSet权限的用户使用数据连接器功能构造消息逃逸沙箱并促进XSS。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
xibosignagexibo-cms < 4.4.2 -

II. Public POCs for CVE-2026-42558

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8098 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-42558

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Vendor Advisories for CVE-2026-42558 (1)

IV. Related Vulnerabilities

Same product: xibo-cms
Same vendor: xibosignage
Same weakness: CWE-79

V. Comments for CVE-2026-42558

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