What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-28 · updated 2026-10-29
• Weakness: CWE-862

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.

Affected products

• xibosignage xibo-cms: before 4.4.3

References

• https://github.com/xibosignage/xibo-cms/commit/13ed6e6bf3c15a93089b4fd2148379888ee82d74
• https://github.com/xibosignage/xibo-cms/commit/1dcc3f2de6dc7861e7dbb5148e94f14ebb1513b3
• https://github.com/xibosignage/xibo-cms/pull/3487
• https://github.com/xibosignage/xibo-cms/releases/tag/4.4.3
• https://github.com/xibosignage/xibo-cms/releases/tag/4.5.0-beta
• https://github.com/xibosignage/xibo-cms/security/advisories/GHSA-p4pg-v57g-7jf6

Get alerted when CVE-2026-50539 or the next vulnerability affects your stack