CVE-2026-50539 Details
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.
A vulnerability in Xibo CMS prior to version 4.4.3 allows authenticated users to download attachments from any notification via the notification export endpoint. This issue arises from missing object-level authorization, enabling users to access attachments from notifications created by administrators by sequentially iterating over notification IDs. Exploitation requires access to the Notification Centre, a privilege typically granted to non-administrators.
Users should upgrade to Xibo CMS version 4.4.3 or later, which addresses this vulnerability. For users unable to upgrade, it is recommended to revoke Notification Centre access from untrusted users.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 28, 2026CISA-ADP
Assessed Oct 28, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/xibosignage/xibo-cms/commit/13ed6e6bf3c15a93089b4fd2148379888ee82d74 | [email protected] | Source CodeVendor |
| https://github.com/xibosignage/xibo-cms/commit/1dcc3f2de6dc7861e7dbb5148e94f14ebb1513b3 | [email protected] | Source CodeVendor |
| https://github.com/xibosignage/xibo-cms/pull/3487 | [email protected] | Source CodeVendor |
| https://github.com/xibosignage/xibo-cms/releases/tag/4.4.3 | [email protected] | Release NotesVendor |
| https://github.com/xibosignage/xibo-cms/releases/tag/4.5.0-beta | [email protected] | Release NotesVendor |
| https://github.com/xibosignage/xibo-cms/security/advisories/GHSA-p4pg-v57g-7jf6 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Xibo | 4.4.2 (semver) |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 4, 2026 | CVE Translated | [email protected] |
| Oct 28, 2026 | New CVE Received | [email protected] |
| Oct 28, 2026 | CVE Modified | CISA-ADP |