{"id":"CVE-2026-62851","kind":"vulnerability","aliases":["CVE-2026-62851"],"related":[],"title":"FreeScout: agents can confirm tickets in other mailboxes via search","description":"FreeScout is a self-hosted help desk and shared mailbox. Prior to 1.8.226, the search-by-number shortcut in ConversationsController::search() resolves a user-controlled ticket number without applying the mailbox filter or view policy used by the normal search path. An authenticated non-admin agent who is a member of at least one mailbox can request /search with a hash-prefixed ticket number and use the 302 Location header to confirm that a conversation exists in a different mailbox the agent cannot access and learn its internal conversation and folder identifiers. The destination conversation remains protected, so this issue does not disclose message content, attachments, or customer data. This issue is fixed in version 1.8.226.","summary":"FreeScout's search-by-ticket-number shortcut skips the mailbox access check, so a logged-in agent can tell whether a conversation exists in a mailbox they cannot open. The attacker learns internal conversation and folder identifiers, but not message content, attachments, or customer data.","severity":"medium","cvss":4.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freescout","package","php","self-hosted"],"not_affected_if":["managed-hosting","single-mailbox","version-1.8.226-or-later"],"how_to_check":"- Check the installed FreeScout version and compare it with `1.8.226`\n- Look for mailboxes whose agents should not see each other's conversations, since those are the setups where this matters","fix":"- FreeScout: upgrade to `1.8.226` or later","status":"open","published_at":"2026-11-06T17:18:33+00:00","first_seen_at":"2026-11-06T17:43:14+00:00","triaged_at":"2026-11-06T17:45:37+00:00","updated_at":"2026-11-06T17:45:37+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-11-06T17:45:37Z","model":"claude-haiku-5-5","output":{"fix":"- FreeScout: upgrade to `1.8.226` or later","reach":"network","title":"FreeScout: agents can confirm tickets in other mailboxes via search","impact":"low","summary":"FreeScout's search-by-ticket-number shortcut skips the mailbox access check, so a logged-in agent can tell whether a conversation exists in a mailbox they cannot open. The attacker learns internal conversation and folder identifiers, but not message content, attachments, or customer data.","audience":"businesses","category":"package","nicknames":[],"who_cares":["freescout","self-hosted","php"],"confidence":0.8,"fix_status":"available","needs_auth":"yes","worst_case":"Agent learns internal IDs and existence of conversations in other mailboxes","analyst_note":"","how_to_check":"- Check the installed FreeScout version and compare it with `1.8.226`\n- Look for mailboxes whose agents should not see each other's conversations, since those are the setups where this matters","plain_action":"","needs_analyst":false,"not_affected_if":["single-mailbox","managed-hosting","version-1.8.226-or-later"],"who_is_affected":"Teams that self-host FreeScout and have several mailboxes with agents limited to some of them. The flaw needs an authenticated non-admin agent who belongs to at least one mailbox. Single-mailbox installs or installs where every agent can see every mailbox are not meaningfully exposed.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000704,"input_tokens":4380,"output_tokens":531,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-62851':13A,16A '/search':131C '1.8.226':83C,190C '302':142C 'access':34B,158C 'admin':118C 'agent':2A,41B,119C,156C 'appli':101C 'attach':66B,180C 'attack':55B 'authent':115C 'cannot':52B,157C 'check':35B 'confirm':4A,146C 'content':65B,179C 'control':97C 'convers':46B,58B,149C,163C,169C 'conversationscontrol':91C 'custom':68B,182C 'cve':11A,14A 'data':69B,183C 'desk':77C 'destin':168C 'differ':153C 'disclos':177C 'exist':47B,150C 'filter':104C 'fix':187C 'folder':60B,165C 'freescout':1A,17B,23B,70C 'hash':135C 'hash-prefix':134C 'header':144C 'help':76C 'host':22B,75C 'identifi':61B,166C 'intern':57B,162C 'issu':174C,185C 'learn':56B,160C 'least':126C 'locat':143C 'log':39B 'logged-in':38B 'mailbox':8A,33B,50B,80C,103C,128C,154C 'member':123C 'messag':64B,178C 'non':117C 'non-admin':116C 'normal':111C 'number':29B,88C,99C,138C 'one':127C 'open':53B 'packag':18B 'path':113C 'php':19B 'polici':107C 'prefix':136C 'prior':81C 'protect':171C 'remain':170C 'request':130C 'resolv':93C 'search':10A,26B,86C,92C,112C 'search-by-numb':85C 'search-by-ticket-numb':25B 'self':21B,74C 'self-host':20B,73C 'share':79C 'shortcut':30B,89C 'skip':31B 'tell':43B 'ticket':5A,28B,98C,137C 'use':108C,140C 'user':96C 'user-control':95C 'version':189C 'via':9A 'view':106C 'whether':44B 'without':100C","nicknames":[],"mitigations":[],"who_affected":"Teams that self-host FreeScout and have several mailboxes with agents limited to some of them. The flaw needs an authenticated non-admin agent who belongs to at least one mailbox. Single-mailbox installs or installs where every agent can see every mailbox are not meaningfully exposed.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["freescout","medium","package","php","selfhosted"],"campaign_type":null,"search_a":"'-2026':12A,15A '-62851':13A,16A 'agent':2A 'confirm':4A 'cve':11A,14A 'freescout':1A 'mailbox':8A 'search':10A 'ticket':5A 'via':9A","search_b":"'access':34B 'agent':41B 'attach':66B 'attack':55B 'cannot':52B 'check':35B 'content':65B 'convers':46B,58B 'custom':68B 'data':69B 'exist':47B 'folder':60B 'freescout':17B,23B 'host':22B 'identifi':61B 'intern':57B 'learn':56B 'log':39B 'logged-in':38B 'mailbox':33B,50B 'messag':64B 'number':29B 'open':53B 'packag':18B 'php':19B 'search':26B 'search-by-ticket-numb':25B 'self':21B 'self-host':20B 'shortcut':30B 'skip':31B 'tell':43B 'ticket':28B 'whether':44B","search_c":"'/search':131C '1.8.226':83C,190C '302':142C 'access':158C 'admin':118C 'agent':119C,156C 'appli':101C 'attach':180C 'authent':115C 'cannot':157C 'confirm':146C 'content':179C 'control':97C 'convers':149C,163C,169C 'conversationscontrol':91C 'custom':182C 'data':183C 'desk':77C 'destin':168C 'differ':153C 'disclos':177C 'exist':150C 'filter':104C 'fix':187C 'folder':165C 'freescout':70C 'hash':135C 'hash-prefix':134C 'header':144C 'help':76C 'host':75C 'identifi':166C 'intern':162C 'issu':174C,185C 'learn':160C 'least':126C 'locat':143C 'mailbox':80C,103C,128C,154C 'member':123C 'messag':178C 'non':117C 'non-admin':116C 'normal':111C 'number':88C,99C,138C 'one':127C 'path':113C 'polici':107C 'prefix':136C 'prior':81C 'protect':171C 'remain':170C 'request':130C 'resolv':93C 'search':86C,92C,112C 'search-by-numb':85C 'self':74C 'self-host':73C 'share':79C 'shortcut':89C 'ticket':98C,137C 'use':108C,140C 'user':96C 'user-control':95C 'version':189C 'view':106C 'without':100C","first_public_at":"2026-07-15T09:56:35+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-62851","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62851","severity":null,"published_at":"2026-11-06T17:18:33+00:00","modified_at":"2026-11-06T17:18:33+00:00","first_seen_at":"2026-11-06T17:43:14+00:00","fetched_at":"2026-11-06T17:43:14+00:00","note":null}],"documents":[{"id":88384,"url":"https://github.com/freescout-help-desk/freescout/commit/4e197d8ce97eb6610ef71402d8c2512824a9a1b5","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":88385,"url":"https://github.com/freescout-help-desk/freescout/releases/tag/1.8.226","title":"Release notes: github.com","kind":"release","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Release notes: github.com"},{"id":88386,"url":"https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-wqq7-4q7m-273v","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-07-15T09:56:35+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.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"}