{"id":"CVE-2026-116596","kind":"vulnerability","aliases":["CVE-2026-116596"],"related":[],"title":"Pyrus Sync for Windows: missing authorization lets local users gain privileges","description":"Pyrus Sync for Windows contains a local privilege escalation vulnerability caused by missing authorization controls in its PyrusSyncService Windows service, which allow an attacker with unprivileged access to create files using the ISyncService contract.","summary":"Pyrus Sync for Windows runs a service named PyrusSyncService that does not enforce authorization checks on its ISyncService contract. A local attacker with unprivileged access can use it to create files and escalate privileges on the Windows machine.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["other","pyrus-sync","windows"],"not_affected_if":["product-not-installed"],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-26T17:17:27+00:00","first_seen_at":"2026-10-26T17:31:22+00:00","triaged_at":"2026-10-26T17:33:32+00:00","updated_at":"2026-10-26T17:33:32+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-26T17:33:32Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"local","title":"Pyrus Sync for Windows: missing authorization lets local users gain privileges","impact":"high","summary":"Pyrus Sync for Windows runs a service named PyrusSyncService that does not enforce authorization checks on its ISyncService contract. A local attacker with unprivileged access can use it to create files and escalate privileges on the Windows machine.","category":"other","nicknames":[],"who_cares":["windows","pyrus-sync"],"confidence":0.6,"needs_auth":"yes","worst_case":"local user escalates to higher privileges on Windows","analyst_note":"Find affected and fixed Pyrus Sync versions and the vendor advisory, since the NVD entry gives no version range.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["product-not-installed"],"who_is_affected":"Machines where Pyrus Sync for Windows is installed and its PyrusSyncService Windows service is running. Users on shared Windows hosts are the most exposed, since the attacker only needs a local unprivileged account. Systems without Pyrus Sync installed are not affected.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000544,"input_tokens":3289,"output_tokens":431,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-116596':14A,17A '-2026':13A,16A 'access':47B,87C 'allow':82C 'attack':44B,84C 'author':6A,36B,74C 'caus':71C 'check':37B 'contain':65C 'contract':41B,94C 'control':75C 'creat':52B,89C 'cve':12A,15A 'enforc':35B 'escal':55B,69C 'file':53B,90C 'gain':10A 'isyncservic':40B,93C 'let':7A 'local':8A,43B,67C 'machin':60B 'miss':5A,73C 'name':30B 'privileg':11A,56B,68C 'pyrus':1A,20B,23B,61C 'pyrus-sync':19B 'pyrussyncservic':31B,78C 'run':27B 'servic':29B,80C 'sync':2A,21B,24B,62C 'unprivileg':46B,86C 'use':49B,91C 'user':9A 'vulner':70C 'window':4A,22B,26B,59B,64C,79C","nicknames":[],"mitigations":[],"who_affected":"Machines where Pyrus Sync for Windows is installed and its PyrusSyncService Windows service is running. Users on shared Windows hosts are the most exposed, since the attacker only needs a local unprivileged account. Systems without Pyrus Sync installed are not affected.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T17:17:27+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-116596","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116596","severity":null,"published_at":"2026-10-26T17:17:27+00:00","modified_at":"2026-10-26T17:17:27+00:00","first_seen_at":"2026-10-26T17:31:22+00:00","fetched_at":"2026-10-26T17:31:22+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"}