Missing authorization in Xibo exposes notification attachments
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
Xibo CMS before 4.4.3 does not check authorization on the /notification/export/{id} endpoint, a missing authorization flaw (CWE-862). An authenticated user can download attachments from any notification, including administrator notifications, by iterating over sequential notification IDs. Exploitation requires access to the Notification Centre, which non-administrators receive by default.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| xibosignage | xibo-cms | before 4.4.3 | 4.4.3 | Patch available | CNA |
- xibo-cms Vendorxibosignage Affected before 4.4.3 Fixed in 4.4.3 Patch available CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:xibosignage:xibo:*:*:*:*:*:*:*:* | — | — | xibosignage |
- cpe:2.3:a:xibosignage:xibo:*:*:*:*:*:*:*:* Versions — — ·xibosignage
Remediation
Upgrade Xibo CMS to version 4.4.3, which fixes this issue.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
- Fix · CNA xibo-cms (xibosignage) Fixed in 4.4.3
Timeline
- 2026-10-28 Threatist record created from CVE-2026-50539
- 2026-10-28 CISA SSVC decision points changed
- 2026-10-28 Priority changed: MEDIUM → LOW
References
Other 6
- https://github.com/xibosignage/xibo-cms/security/advisories/GHSA-p4pg-v57g-7jf6
- https://github.com/xibosignage/xibo-cms/pull/3487
- https://github.com/xibosignage/xibo-cms/commit/13ed6e6bf3c15a93089b4fd2148379888ee82d74
- https://github.com/xibosignage/xibo-cms/commit/1dcc3f2de6dc7861e7dbb5148e94f14ebb1513b3
- https://github.com/xibosignage/xibo-cms/releases/tag/4.4.3
- https://github.com/xibosignage/xibo-cms/releases/tag/4.5.0-beta
More xibosignage vulnerabilities
- TI-2023-16354 Xibo CMS vulnerable to Remote Code Execution through Zip Slip CVSS 3.1HIGH 8.8
- TI-2024-19204 Session Hijacking via XSS attack in header and session grid in Xibo CMS CVSS 3.1HIGH 8.8
- TI-2013-05097 Directory traversal vulnerability in Spring Signage Xibo 1.2.x before 1.2.3 and 1.4.x… CVSS 2.0MEDIUM 5.0
- TI-2024-27847 Xibo allows Sensitive Information Disclosure abusing SQL Injection in Xibo CMS DataSet Data Import CVSS 3.1HIGH 8.1
- TI-2025-38637 Xibo CMS: Remote Code Execution through module templates CVSS 3.1HIGH 7.2
- TI-2026-24496 Xibo CMS API has SQL Injection via DataSet Filter Parameter CVSS 3.1HIGH 8.1
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences