{"id":"CVE-2026-3502","kind":"vulnerability","aliases":["CVE-2026-3502"],"related":[],"title":"TrueConf Client downloads application update code and applies it without performing verification","description":"TrueConf Client contains a download of code without integrity check vulnerability. An attacker who is able to influence the update delivery path can substitute a tampered update payload. If the payload is executed or installed by the updater, this may result in arbitrary code execution in the context of the updating process or user.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"TrueConf Client downloads update code without verifying its integrity, so an attacker who can influence the update delivery path can swap in a tampered payload. If the updater runs or installs that payload, the attacker gets code execution in the context of the updating process or user.","severity":"high","cvss":7.8,"epss":null,"exploited":true,"exploited_at":"2026-04-02T00:00:00+00:00","products":[{"name":"TrueConf Client","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"trueconf","fixed":["8.5.3.884"],"affected":"< 8.5.3.884","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","trueconf-client","vendor","windows"],"not_affected_if":["not-installed"],"how_to_check":null,"fix":"Apply the vendor mitigation per TrueConf instructions, or discontinue use of the TrueConf Client if mitigations are unavailable (CISA KEV required action). Fixed version: unknown.","status":"open","published_at":"2026-03-30T19:16:27+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:38:57+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"vendor","confidence":0.5,"triage":{"at":"2026-10-23T20:38:57Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor mitigation per TrueConf instructions, or discontinue use of the TrueConf Client if mitigations are unavailable (CISA KEV required action). Fixed version: unknown.","reach":"network","summary":"TrueConf Client downloads update code without verifying its integrity, so an attacker who can influence the update delivery path can swap in a tampered payload. If the updater runs or installs that payload, the attacker gets code execution in the context of the updating process or user.","category":"vendor","who_cares":["trueconf-client","windows"],"confidence":0.5,"needs_auth":"unknown","worst_case":"Attacker runs arbitrary code as the updating process or logged-in user.","analyst_note":"Find TrueConf's vendor advisory and mitigation steps, affected and fixed versions, and the exact update delivery path to check; the KEV entry lacks these.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["not-installed"],"user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000445,"input_tokens":2569,"output_tokens":376,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':141C '-2026':14A,17A '-3502':15A,18A '22':140C 'abl':90C 'action':131C 'appli':8A,132C 'applic':4A,138C 'arbitrari':117C 'attack':39B,62B,87C 'bod':139C 'check':84C 'cisa':129C 'client':2A,20A,25B,29B,76C 'cloud':144C 'code':6A,32B,64B,81C,118C 'contain':77C 'context':68B,122C 'cve':13A,16A 'deliveri':45B,95C 'discontinu':147C 'download':3A,30B,79C 'execut':65B,107C,119C 'exploit':22B 'follow':137C 'get':63B 'guidanc':142C 'influenc':42B,92C 'instal':58B,109C 'instruct':136C 'integr':36B,83C 'may':114C 'mitig':133C,153C 'path':46B,96C 'payload':52B,60B,102C,105C 'per':134C 'perform':11A 'process':72B,126C 'product':151C 'requir':130C 'result':115C 'run':56B 'servic':145C 'substitut':98C 'swap':48B 'tamper':51B,100C 'trueconf':1A,19A,21A,24B,28B,75C 'trueconf-cli':23B 'unavail':155C 'updat':5A,31B,44B,55B,71B,94C,101C,112C,125C 'use':148C 'user':74B,128C 'vendor':26B,135C 'verif':12A 'verifi':34B 'vulner':85C 'window':27B 'without':10A,33B,82C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-03-30T19:16:27+00:00","kev":{"dateAdded":"2026-04-02","dueDate":"2026-04-16","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L","cvss_by":"cve@checkpoint.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2026-3502","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-3502","severity":null,"published_at":"2026-04-02T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T16:39:45+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-3502","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3502","severity":null,"published_at":"2026-03-30T19:16:27+00:00","modified_at":"2026-06-17T10:43:41+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+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"}