{"id":"CVE-2026-50543","kind":"vulnerability","aliases":["CVE-2026-50543"],"related":[],"title":"Xibo: missing authorization lets users alter display schedule criteria","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.","summary":"Xibo is an open source digital signage platform. Before 4.4.3, an authenticated user can send criteria updates to any display through XMR, changing which content plays, for example swapping in weather-based content.","severity":"medium","cvss":4.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["digital-signage","package","self-hosted","xibo"],"not_affected_if":["managed-hosting","schedule-criteria-unused","version-4.4.3-or-later"],"how_to_check":"- Check the installed Xibo CMS version in the admin UI or the release in use; it is affected if below `4.4.3`.\n- Check whether `Schedule Criteria` is in use on the CMS (unknown how to query this from the sources).","fix":"- Upgrade Xibo CMS to `4.4.3` or later.","status":"open","published_at":"2026-10-28T16:17:08+00:00","first_seen_at":"2026-10-28T16:33:49+00:00","triaged_at":"2026-10-28T16:35:58+00:00","updated_at":"2026-10-28T16:35:58+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-10-28T16:35:58Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Xibo CMS to `4.4.3` or later.","reach":"network","title":"Xibo: missing authorization lets users alter display schedule criteria","impact":"low","summary":"Xibo is an open source digital signage platform. Before 4.4.3, an authenticated user can send criteria updates to any display through XMR, changing which content plays, for example swapping in weather-based content.","category":"package","nicknames":[],"who_cares":["xibo","digital-signage","self-hosted"],"confidence":0.8,"needs_auth":"yes","worst_case":"Authenticated users alter display playback schedules on any display","analyst_note":"","how_to_check":"- Check the installed Xibo CMS version in the admin UI or the release in use; it is affected if below `4.4.3`.\n- Check whether `Schedule Criteria` is in use on the CMS (unknown how to query this from the sources).","needs_analyst":false,"not_affected_if":["managed-hosting","schedule-criteria-unused","version-4.4.3-or-later"],"who_is_affected":"Self-hosted Xibo CMS instances before 4.4.3 that use Schedule Criteria. An attacker needs a valid account on the CMS; without Schedule Criteria in use the sources say the issue does not apply. Managed Xibo hosting is handled by the vendor.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000588,"input_tokens":3386,"output_tokens":499,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':11A,14A '-50543':12A,15A '/displaygroup/criteria':84C '4.4.3':33B,79C,141C 'allow':86C 'alter':6A,106C 'authent':35B,88C 'author':3A,81C 'base':56B 'caus':111C 'chang':46B,103C 'cms':134C 'content':48B,57B,69C,112C 'criteria':9A,39B,92C,100C,127C 'cve':10A,13A 'determin':101C 'digit':17B,29B,63C 'digital-signag':16B 'display':7A,43B,74C,96C 'displaygroupid':85C 'exampl':51B,109C 'exploit':124C 'fix':138C 'host':22B 'issu':136C 'let':4A 'manag':70C 'miss':2A,80C 'open':27B,61C 'packag':19B 'platform':31B,65C 'play':49B,118C 'playback':107C 'player':75C 'post':83C 'prior':77C 'rain':123C 'raini':115C 'requir':125C 'schedul':8A,102C,113C,126C 'self':21B 'self-host':20B 'send':38B,91C 'signag':18B,30B,64C 'softwar':76C 'sourc':28B,62C 'swap':52B 'system':71C 'updat':40B,93C 'use':131C 'user':5A,36B,89C 'version':140C 'via':97C 'weather':55B,116C 'weather-bas':54B 'web':68C 'window':73C 'xibo':1A,23B,24B,58C 'xmr':45B,98C","nicknames":[],"mitigations":[],"who_affected":"Self-hosted Xibo CMS instances before 4.4.3 that use Schedule Criteria. An attacker needs a valid account on the CMS; without Schedule Criteria in use the sources say the issue does not apply. Managed Xibo hosting is handled by the vendor.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-28T16:17:08+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-50543","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50543","severity":null,"published_at":"2026-10-28T16:17:08+00:00","modified_at":"2026-10-28T16:17:08+00:00","first_seen_at":"2026-10-28T16:33:49+00:00","fetched_at":"2026-10-28T16:33:49+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}