{"id":"CVE-2026-77873","kind":"vulnerability","aliases":["CVE-2026-77873"],"related":[],"title":"Lenovo System Update: local users can run code with elevated privileges","description":"An improper permissions vulnerability was reported in Lenovo System Update that could allow a local authenticated user to execute code with elevated privileges.","summary":"Lenovo System Update has an improper permissions flaw that lets a local, logged-in user run code with higher privileges. An attacker with a standard account on a Lenovo machine could gain administrator or system-level control.","severity":"high","cvss":7.3,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"System Update","fixed":[],"affected":"<= 5.08.03.59","ecosystem":"vendor"}],"ecosystems":[],"tags":["endpoints","lenovo","local-privilege-escalation","other","system-update","windows"],"not_affected_if":["no-local-untrusted-users","no-system-update"],"how_to_check":"Open Lenovo System Update > About, or check the installed version in Windows Apps. Per the CVE record (as mirrored), versions up to and including 5.08.03.59 are listed as affected. The fixed version is not confirmed.","fix":"unknown: Lenovo's advisory for this CVE was not located. Update System Update to the latest version from Lenovo's page (support.lenovo.com/solutions/ht037099) and confirm against the Lenovo advisory.","status":"open","published_at":"2026-11-11T17:17:19+00:00","first_seen_at":"2026-11-11T17:28:22+00:00","triaged_at":"2026-11-11T17:28:40+00:00","updated_at":"2026-11-11T17:30:03+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-11T17:28:40Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Lenovo System Update: local users can run code with elevated privileges","impact":"high","summary":"Lenovo System Update has an improper permissions flaw that lets a local, logged-in user run code with higher privileges. An attacker with a standard account on a Lenovo machine could gain administrator or system-level control.","audience":"businesses","category":"other","nicknames":[],"who_cares":["lenovo","windows","endpoints"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains elevated privileges on the machine","analyst_note":"Find the Lenovo PSIRT advisory for CVE-2026-77873 to get affected and fixed System Update versions and any remediation.","how_to_check":"- Open Lenovo System Update and check its version against the vendor's advisory\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-local-untrusted-users"],"who_is_affected":"Anyone running Lenovo System Update on a Lenovo device where other local users can log in. The sources do not list affected version ranges. Systems with only a single trusted user are lower risk.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000673,"input_tokens":4495,"output_tokens":446,"severity_before":"high"},"analyst_status":"done","analyst_note":"Find the Lenovo PSIRT advisory for CVE-2026-77873 to get affected and fixed System Update versions and any remediation.","search":"'-2026':13A,16A '-77873':14A,17A 'account':57B 'administr':64B 'allow':82C 'attack':53B 'authent':85C 'code':8A,48B,89C 'control':69B 'could':62B,81C 'cve':12A,15A 'elev':10A,91C 'endpoint':20B 'escal':25B 'execut':88C 'flaw':38B 'gain':63B 'higher':50B 'improp':36B,71C 'lenovo':1A,21B,31B,60B,77C 'let':40B 'level':68B 'local':4A,23B,42B,84C 'local-privilege-escal':22B 'log':44B 'logged-in':43B 'machin':61B 'permiss':37B,72C 'privileg':11A,24B,51B,92C 'report':75C 'run':7A,47B 'standard':56B 'system':2A,18A,28B,32B,67B,78C 'system-level':66B 'system-upd':27B 'updat':3A,29B,33B,79C 'update':19A 'user':5A,46B,86C 'vulner':73C 'window':30B","nicknames":[],"mitigations":[],"who_affected":"Windows PCs with Lenovo System Update installed, at or below 5.08.03.59 per the CVE record. It needs a local, logged-in user, so it matters most on shared or multi-user machines and where a malware foothold could escalate. Machines without System Update, or with it removed, can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":["systemupdate","update"],"ptokens":["system","update"],"labels":["endpoints","high","lenovo","localprivilegeescalation","other","systemupdate","windows"],"campaign_type":null,"search_a":"'-2026':13A,16A '-77873':14A,17A 'code':8A 'cve':12A,15A 'elev':10A 'lenovo':1A 'local':4A 'privileg':11A 'run':7A 'system':2A,18A 'updat':3A 'update':19A 'user':5A","search_b":"'account':57B 'administr':64B 'attack':53B 'code':48B 'control':69B 'could':62B 'endpoint':20B 'escal':25B 'flaw':38B 'gain':63B 'higher':50B 'improp':36B 'lenovo':21B,31B,60B 'let':40B 'level':68B 'local':23B,42B 'local-privilege-escal':22B 'log':44B 'logged-in':43B 'machin':61B 'permiss':37B 'privileg':24B,51B 'run':47B 'standard':56B 'system':28B,32B,67B 'system-level':66B 'system-upd':27B 'updat':29B,33B 'user':46B 'window':30B","search_c":"'allow':82C 'authent':85C 'code':89C 'could':81C 'elev':91C 'execut':88C 'improp':71C 'lenovo':77C 'local':84C 'permiss':72C 'privileg':92C 'report':75C 'system':78C 'updat':79C 'user':86C 'vulner':73C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-11T17:17:19+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/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":"psirt@lenovo.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-77873","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77873","severity":null,"published_at":"2026-11-11T17:17:19+00:00","modified_at":"2026-11-11T17:17:19+00:00","first_seen_at":"2026-11-11T17:28:22+00:00","fetched_at":"2026-11-11T17:28:22+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-77873:3572","url":"https://cve.imfht.com/detail/CVE-2026-77873","severity":null,"published_at":"2026-11-11T17:30:03+00:00","modified_at":"2026-11-11T17:30:03+00:00","first_seen_at":"2026-11-11T17:30:03+00:00","fetched_at":"2026-11-11T17:30:03+00:00","note":"Lenovo PSIRT advisory not found (web-cli search; NVD page unreadable). Affected range 0 to 5.08.03.59 from CVE List V5 via mirror only; fix version unknown. Nothing verified. No exploitation or PoC seen. X not searched.","cites":["https://cve.imfht.com/detail/CVE-2026-77873","https://support.lenovo.com/gb/da/solutions/ht037099"]}],"documents":[{"id":127431,"url":"https://cve.imfht.com/detail/CVE-2026-77873","title":"CVE-2026-77873 (mirror of CVE List V5 record)","kind":"other","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"describes","confidence":null,"note":null},{"id":127433,"url":"https://support.lenovo.com/gb/da/solutions/ht037099","title":"Lenovo System Update download page","kind":"vendor","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"mentions","confidence":null,"note":null}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}