Auth bypass in Xibosignage Xibo-Cms
CVE-2026-50543
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 authorization on `POST /displaygroup/criteria/{displayGroupId}` allows an authenticated user to send criteria updates to any display via `XMR`. These criteria determine schedule changes and can alter playback, for example by causing content scheduled for rainy weather to play when it is not raining. Exploitation requires `Schedule Criteria` to be in use on the CMS. This issue is fixed in version 4.4.3.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Xibosignage Xibo-Cms — versions < 4.4.3
Weakness classification (CWE)
References
- github.com/xibosignage/xibo-cms/security/advisories/GHSA-737f-mfxg-jv9q
- github.com/xibosignage/xibo-cms/pull/3488
- github.com/xibosignage/xibo-cms/commit/93587cf872392e91534bb50aa6be071821383e25
- github.com/xibosignage/xibo-cms/commit/aeca5d6bfbc5eb8a825e6950913c9ab25dc9edc0
- github.com/xibosignage/xibo-cms/releases/tag/4.4.3
- github.com/xibosignage/xibo-cms/releases/tag/4.5.0-beta
Frequently asked questions
- What is CVE-2026-50543?
- CVE-2026-50543 is a medium-severity vulnerability in Xibosignage Xibo-Cms, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-28.
- How severe is CVE-2026-50543?
- Medium severity. CVSS v3 base score is 4.3 out of 10.