{"id":"CVE-2026-63401","kind":"vulnerability","aliases":["CVE-2026-63401"],"related":[],"title":"Coop: cross-organization queue access can be granted or revoked by a user","description":"Coop is an open source review and moderation tool from ROOST. Prior to 1.0.2, `addAccessibleQueuesForUser` and `removeAccessibleQueuesForUser` accepted arbitrary `queueId` and `userId` values without organization scoping. An authenticated user belonging to one organization and holding MRT queue-edit permission could grant or revoke another organization's users' access to manual review queues. The existing queue-edit permission check did not bind the supplied identifiers to the caller's organization. The attacker could not read the other organization's queues or jobs, so this issue did not disclose confidential data. This issue is fixed in version 1.0.2.","summary":"Coop, an open source review and moderation tool from ROOST, let a user with queue-edit permission in one organization grant or revoke queue access for users in another organization. The attacker cannot read the other organization's queues or jobs, so the impact is unauthorized changes to who can review content.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["coop","other","roost","self-hosted"],"not_affected_if":["single-organization","version-1.0.2-or-later"],"how_to_check":"- Check the installed Coop version; the sources say versions before `1.0.2` are affected.\n- Review which organizations share a Coop deployment and who holds MRT queue-edit permission.","fix":"- Move to `1.0.2` or later, per the sources.","status":"open","published_at":"2026-10-30T23:17:15+00:00","first_seen_at":"2026-10-30T23:26:12+00:00","triaged_at":"2026-10-30T23:28:11+00:00","updated_at":"2026-10-30T23:28:11+00:00","category":"other","confidence":0.7,"triage":{"at":"2026-10-30T23:28:11Z","model":"claude-haiku-5-5","output":{"fix":"- Move to `1.0.2` or later, per the sources.","reach":"network","title":"Coop: cross-organization queue access can be granted or revoked by a user","impact":"medium","summary":"Coop, an open source review and moderation tool from ROOST, let a user with queue-edit permission in one organization grant or revoke queue access for users in another organization. The attacker cannot read the other organization's queues or jobs, so the impact is unauthorized changes to who can review content.","audience":"businesses","category":"other","nicknames":[],"who_cares":["coop","roost","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"Attacker changes which users can access another organization's review queues","analyst_note":"","how_to_check":"- Check the installed Coop version; the sources say versions before `1.0.2` are affected.\n- Review which organizations share a Coop deployment and who holds MRT queue-edit permission.","plain_action":"","needs_analyst":false,"not_affected_if":["version-1.0.2-or-later","single-organization"],"who_is_affected":"Teams running Coop before version 1.0.2 with more than one organization on the same deployment, where some users hold MRT queue-edit permission. Single-organization deployments or those already on 1.0.2 are not affected by the cross-organization part, according to the description.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000673,"input_tokens":4223,"output_tokens":501,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':16A,19A '-63401':17A,20A '1.0.2':93C,177C 'accept':97C 'access':6A,52B,128C 'addaccessiblequeuesforus':94C 'anoth':56B,124C 'arbitrari':98C 'attack':59B,152C 'authent':107C 'belong':109C 'bind':142C 'caller':148C 'cannot':60B 'chang':74B 'check':139C 'confidenti':169C 'content':79B 'coop':1A,21B,27B,80C 'could':120C,153C 'cross':3A 'cross-organ':2A 'cve':15A,18A 'data':170C 'disclos':168C 'edit':43B,118C,137C 'exist':134C 'fix':174C 'grant':9A,48B,121C 'hold':114C 'host':26B 'identifi':145C 'impact':71B 'issu':165C,172C 'job':68B,162C 'let':37B 'manual':130C 'moder':33B,87C 'mrt':115C 'one':46B,111C 'open':29B,83C 'organ':4A,47B,57B,64B,104C,112C,125C,150C,158C 'permiss':44B,119C,138C 'prior':91C 'queue':5A,42B,51B,66B,117C,132C,136C,160C 'queue-edit':41B,116C,135C 'queueid':99C 'read':61B,155C 'removeaccessiblequeuesforus':96C 'review':31B,78B,85C,131C 'revok':11A,50B,123C 'roost':23B,36B,90C 'scope':105C 'self':25B 'self-host':24B 'sourc':30B,84C 'suppli':144C 'tool':34B,88C 'unauthor':73B 'user':14A,39B,54B,108C,127C 'userid':101C 'valu':102C 'version':176C 'without':103C","nicknames":[],"mitigations":[],"who_affected":"Teams running Coop before version 1.0.2 with more than one organization on the same deployment, where some users hold MRT queue-edit permission. Single-organization deployments or those already on 1.0.2 are not affected by the cross-organization part, according to the description.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"first_public_at":"2026-10-30T23:17:15+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/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":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-63401","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63401","severity":null,"published_at":"2026-10-30T23:17:15+00:00","modified_at":"2026-10-30T23:17:15+00:00","first_seen_at":"2026-10-30T23:26:12+00:00","fetched_at":"2026-10-30T23:26:12+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"}