{"id":"CVE-2026-87099","kind":"vulnerability","aliases":["CVE-2026-87099"],"related":[],"title":"Acronis Cyber Protect 17: cross-site scripting via improper input validation","description":"Cross-site scripting (XSS) vulnerability due to improper input validation. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 42587.","summary":"Acronis Cyber Protect 17 on Linux and Windows does not properly validate some input, which allows cross-site scripting. An attacker who gets a victim to load a crafted page or link could run script in the victim's browser session within the product.","severity":"medium","cvss":5.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["acronis","cyber-protect","linux","vendor","windows"],"not_affected_if":["build-42587-or-later"],"how_to_check":"- Check the installed Acronis Cyber Protect 17 build number in the product's about or version screen; unknown whether the sources give a specific location.","fix":"- Update Acronis Cyber Protect 17 to build `42587` or later on Linux and Windows.","status":"open","published_at":"2026-10-28T11:17:27+00:00","first_seen_at":"2026-10-28T11:32:33+00:00","triaged_at":"2026-10-28T11:33:32+00:00","updated_at":"2026-10-28T11:33:32+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-28T11:33:32Z","model":"claude-haiku-5-5","output":{"fix":"- Update Acronis Cyber Protect 17 to build `42587` or later on Linux and Windows.","reach":"unknown","title":"Acronis Cyber Protect 17: cross-site scripting via improper input validation","impact":"medium","summary":"Acronis Cyber Protect 17 on Linux and Windows does not properly validate some input, which allows cross-site scripting. An attacker who gets a victim to load a crafted page or link could run script in the victim's browser session within the product.","category":"vendor","nicknames":[],"who_cares":["acronis","cyber-protect","windows","linux"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Script runs in the victim's browser session within the product","analyst_note":"Check the vendor advisory from Acronis for the affected input, required access and the exact fixed build; the NVD entry alone lacks detail.","how_to_check":"- Check the installed Acronis Cyber Protect 17 build number in the product's about or version screen; unknown whether the sources give a specific location.","needs_analyst":true,"not_affected_if":["build-42587-or-later"],"who_is_affected":"Teams running Acronis Cyber Protect 17 builds before `42587` on Linux or Windows. The sources do not say which input fields or configurations are involved, so unknown whether exposure depends on specific settings.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000578,"input_tokens":3267,"output_tokens":502,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-87099':15A,18A '17':4A,29B,90C '42587':95C 'acroni':1A,19B,26B,87C 'affect':86C 'allow':41B 'attack':47B 'browser':66B 'build':94C 'could':59B 'craft':55B 'cross':6A,43B,72C 'cross-sit':5A,42B,71C 'cve':13A,16A 'cyber':2A,21B,27B,88C 'cyber-protect':20B 'due':77C 'follow':83C 'get':49B 'improp':10A,79C 'input':11A,39B,80C 'link':58B 'linux':23B,31B,91C 'load':53B 'page':56B 'product':70B,84C 'proper':36B 'protect':3A,22B,28B,89C 'run':60B 'script':8A,45B,61B,74C 'session':67B 'site':7A,44B,73C 'valid':12A,37B,81C 'vendor':24B 'via':9A 'victim':51B,64B 'vulner':76C 'window':25B,33B,92C 'within':68B 'xss':75C","nicknames":[],"mitigations":[],"who_affected":"Teams running Acronis Cyber Protect 17 builds before `42587` on Linux or Windows. The sources do not say which input fields or configurations are involved, so unknown whether exposure depends on specific settings.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-28T11:17:27+00:00","kev":null,"cvss_vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N","cvss_by":"security@acronis.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-87099","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-87099","severity":null,"published_at":"2026-10-28T11:17:27+00:00","modified_at":"2026-10-28T11:17:27+00:00","first_seen_at":"2026-10-28T11:32:33+00:00","fetched_at":"2026-10-28T11:32:33+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"}