{"id":"CVE-2026-122327","kind":"vulnerability","aliases":["CVE-2026-122327"],"related":[],"title":"Meelo: non-admin users can alter shared music catalog data","description":"Meelo through 3.13.1 contains a missing authorization vulnerability that allows authenticated non-admin users to modify shared catalog data because RolesGuard does not require Admin on song, track and video write routes. Attackers can send PUT requests to /songs/:idOrSlug, /tracks/:idOrSlug or /videos/:idOrSlug, or POST to /songs/:idOrSlug/merge, to alter genres, reassign tracks and merge songs.","summary":"Meelo, a self-hosted music server, has a missing authorization check on its song, track and video write routes. A logged-in user without admin rights can change genres, move tracks between songs and merge songs, altering catalog data for everyone.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["meelo","package","self-hosted"],"not_affected_if":["admin-only-accounts","single-user"],"how_to_check":"- Check the Meelo version running on the server against the affected range (through `3.13.1`)\n- Confirm whether non-admin accounts exist on the instance","fix":null,"status":"open","published_at":"2026-11-05T16:17:45+00:00","first_seen_at":"2026-11-05T16:40:02+00:00","triaged_at":"2026-11-05T16:41:45+00:00","updated_at":"2026-11-05T16:41:45+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-05T16:41:45Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Meelo: non-admin users can alter shared music catalog data","impact":"medium","summary":"Meelo, a self-hosted music server, has a missing authorization check on its song, track and video write routes. A logged-in user without admin rights can change genres, move tracks between songs and merge songs, altering catalog data for everyone.","audience":"businesses","category":"package","nicknames":[],"who_cares":["meelo","self-hosted"],"confidence":0.7,"fix_status":"unknown","needs_auth":"yes","worst_case":"Authenticated users alter shared catalog data and merge songs","analyst_note":"Confirm the fixed version and whether a patch exists; check the vulncheck advisory referenced in the sources.","how_to_check":"- Check the Meelo version running on the server against the affected range (through `3.13.1`)\n- Confirm whether non-admin accounts exist on the instance","plain_action":"","needs_analyst":true,"not_affected_if":["single-user","admin-only-accounts"],"who_is_affected":"Teams that run a Meelo instance with more than one user account are exposed, since any authenticated non-admin user can send write requests to the affected routes. A single-user instance with only admin accounts is not exposed to this specific flaw. The sources do not name a fixed version.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000676,"input_tokens":4303,"output_tokens":491,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-122327':14A,17A '-2026':13A,16A '/songs':105C,115C '/tracks':107C '/videos':110C '3.13.1':68C 'admin':4A,49B,79C,91C 'allow':75C 'alter':7A,61B,118C 'attack':99C 'authent':76C 'author':33B,72C 'catalog':10A,62B,84C 'chang':52B 'check':34B 'contain':69C 'cve':12A,15A 'data':11A,63B,85C 'everyon':65B 'genr':53B,119C 'host':22B,27B 'idorslug':106C,108C,111C 'idorslug/merge':116C 'log':45B 'logged-in':44B 'meelo':1A,18B,23B,66C 'merg':59B,123C 'miss':32B,71C 'modifi':82C 'move':54B 'music':9A,28B 'non':3A,78C 'non-admin':2A,77C 'packag':19B 'post':113C 'put':102C 'reassign':120C 'request':103C 'requir':90C 'right':50B 'rolesguard':87C 'rout':42B,98C 'self':21B,26B 'self-host':20B,25B 'send':101C 'server':29B 'share':8A,83C 'song':37B,57B,60B,93C,124C 'track':38B,55B,94C,121C 'user':5A,47B,80C 'video':40B,96C 'vulner':73C 'without':48B 'write':41B,97C","nicknames":[],"mitigations":[],"who_affected":"Teams that run a Meelo instance with more than one user account are exposed, since any authenticated non-admin user can send write requests to the affected routes. A single-user instance with only admin accounts is not exposed to this specific flaw. The sources do not name a fixed version.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","meelo","package","selfhosted"],"campaign_type":null,"first_public_at":"2026-11-05T16:17:45+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-122327","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122327","severity":null,"published_at":"2026-11-05T16:17:45+00:00","modified_at":"2026-11-05T16:17:45+00:00","first_seen_at":"2026-11-05T16:40:02+00:00","fetched_at":"2026-11-05T16:40:02+00:00","note":null}],"documents":[{"id":77631,"url":"https://www.vulncheck.com/advisories/meelo-through-3.13.1-missing-authorization-on-song-track-and-video-endpoints","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}