# CVE-2026-50543: Xibo: Missing Authorization on POST /displaygroup/criteria/{displayGroupId} Allows Arbitrary Scheduling Criteria Injection to Player Devices

Status: published. Published: 2026-10-28. Updated: 2026-11-03.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- xibosignage / xibo-cms: < 4.4.3 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-02; percentile 12.76%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/xibosignage/xibo-cms/security/advisories/GHSA-737f-mfxg-jv9q (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/xibosignage/xibo-cms/pull/3488 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/xibosignage/xibo-cms/commit/93587cf872392e91534bb50aa6be071821383e25 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/xibosignage/xibo-cms/commit/aeca5d6bfbc5eb8a825e6950913c9ab25dc9edc0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/xibosignage/xibo-cms/releases/tag/4.4.3 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/xibosignage/xibo-cms/releases/tag/4.5.0-beta (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-50543; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-50543; retrieved 2026-11-03; source updated Not reported

Revision: f20119d5dc8bbe808c03330e170930550a139ce2e4258a435fa2b382e08cd496

Canonical: https://y2.dev/cve/CVE-2026-50543

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