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CVE-2026-50539— Xibo: Missing Object-Level Authorization on /notification/export/{id} Allows Authenticated Users to Download Arbitrary Attachments

Quick assessment

Affected
xibosignage xibo-cms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xibo 是一个开源的数字标牌平台，包含 Web 内容管理系统和 Windows 显示播放器软件。在 4.4.3 版本之前， 接口缺少对象级别的授权控制，导致已认证用户能够通过遍历“连续的通知 ID"，下载任意通知（包括由管理员创建的通知）中的附件。利用该漏洞需要访问“通知中心”以查看历史通知，而该权限默认授予非管理员用户。此问题已在 4.4.3 版本中修复。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1562.005

Affected Version Matrix 1

VendorProduct Version RangeStatus
xibosignage xibo-cms < 4.4.3 affected
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I. Basic Information for CVE-2026-50539

Vulnerability Information
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Vulnerability Title
Xibo: Missing Object-Level Authorization on /notification/export/{id} Allows Authenticated Users to Download Arbitrary Attachments
Source: CVE Program / CVE List V5
Vulnerability Description
Xibo is an open source digital signage platform with a web content management system and Windows display player software. Prior to 4.4.3, missing object-level authorization on `/notification/export/{id}` allows an authenticated user to download attachments from any notification, including notifications created by administrators, by iterating over `sequential notification IDs`. Exploitation requires access to the `Notification Centre` to view past notifications, a privilege granted to non-administrators as standard. This issue is fixed in version 4.4.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
xibosignage xibo-cms < 4.4.3 -

II. Public POCs for CVE-2026-50539

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III. Intelligence Information for CVE-2026-50539

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Patches & Fixes for CVE-2026-50539 (3)

Vendor Advisories for CVE-2026-50539 (1)

Vendor Pages for CVE-2026-50539 (2)

Same Patch Batch · xibosignage · 2026-10-28 · 5 CVEs total

CVE-2026-52729 7.1 HIGH Xibo: IDOR (Broken Object-Level Authorization) on PUT/DELETE /action/{id} Allows Arbitrary
CVE-2026-50541 6.5 MEDIUM Xibo: IDOR (Broken Object-Level Authorization) on GET /dataset/export/csv/{id} Allows Arbi
CVE-2026-50542 5.4 MEDIUM Xibo: IDOR (Broken Object-Level Authorization) on GET /layout/status/{id} Allows Arbitrary
CVE-2026-50543 4.3 MEDIUM Xibo: Missing Authorization on POST /displaygroup/criteria/{displayGroupId} Allows Arbitra

IV. Related Vulnerabilities

Same product: xibo-cms
Same vendor: xibosignage
Same weakness: CWE-862