{"id":"CVE-2026-86398","kind":"vulnerability","aliases":["CVE-2026-86398"],"related":[],"title":"Dell PowerProtect Data Domain: path traversal gives attackers filesystem access","description":"Dell PowerProtect Data Domain, Feature Release versions 7.7.1.0 through 8.8, LTS2024 release versions 7.13.1.0 through 7.13.1.80, LTS2025 release versions 8.3.1.0 through 8.3.1.40, LTS2026 release versions 8.6.1.0 through 8.6.1.20, contain an Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to filesystem access for attacker.","summary":"Several Dell PowerProtect Data Domain release lines contain a path traversal flaw that lets a low-privileged remote user reach files outside the intended directory. The sources say an attacker could gain filesystem access on the appliance.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["backup-appliance","data-domain","dell","infrastructure","powerprotect"],"not_affected_if":["unaffected-version"],"how_to_check":"- Check the installed Data Domain OS version against the affected ranges listed in the advisory (Feature Release 7.7.1.0 through 8.8; LTS2024 7.13.1.0 through 7.13.1.80; LTS2025 8.3.1.0 through 8.3.1.40; LTS2026 8.6.1.0 through 8.6.1.20)\n- Confirm the exact version against the Dell security advisory; the sources do not give a command to run","fix":"- Move Data Domain OS to a release outside the affected ranges, as published by Dell (fixed version numbers are unknown from these sources)","status":"open","published_at":"2026-10-28T09:17:07+00:00","first_seen_at":"2026-10-28T09:32:03+00:00","triaged_at":"2026-10-28T09:33:59+00:00","updated_at":"2026-10-28T09:33:59+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-28T09:33:59Z","model":"claude-haiku-5-5","output":{"fix":"- Move Data Domain OS to a release outside the affected ranges, as published by Dell (fixed version numbers are unknown from these sources)","reach":"network","title":"Dell PowerProtect Data Domain: path traversal gives attackers filesystem access","impact":"high","summary":"Several Dell PowerProtect Data Domain release lines contain a path traversal flaw that lets a low-privileged remote user reach files outside the intended directory. The sources say an attacker could gain filesystem access on the appliance.","category":"infrastructure","nicknames":[],"who_cares":["dell","powerprotect","data-domain","backup-appliance"],"confidence":0.6,"needs_auth":"yes","worst_case":"Low-privileged remote attacker reads arbitrary files on the appliance","analyst_note":"Find Dell's advisory for CVE-2026-86398 to confirm fixed versions and exact exposure; the NVD entry gives only the affected ranges.","how_to_check":"- Check the installed Data Domain OS version against the affected ranges listed in the advisory (Feature Release 7.7.1.0 through 8.8; LTS2024 7.13.1.0 through 7.13.1.80; LTS2025 8.3.1.0 through 8.3.1.40; LTS2026 8.6.1.0 through 8.6.1.20)\n- Confirm the exact version against the Dell security advisory; the sources do not give a command to run","needs_analyst":true,"not_affected_if":["unaffected-version"],"who_is_affected":"Organizations running Dell PowerProtect Data Domain appliances on the listed Feature Release or LTS versions with remote access enabled. Sites on other release lines, or with no remote access to the appliance, are less exposed; the sources do not say more.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000666,"input_tokens":3434,"output_tokens":646,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-86398':13A,16A '7.13.1.0':77C '7.13.1.80':79C '7.7.1.0':71C '8.3.1.0':83C '8.3.1.40':85C '8.6.1.0':89C '8.6.1.20':91C '8.8':73C 'access':10A,60B,112C,121C 'applianc':19B,63B 'attack':8A,56B,109C,123C 'backup':18B 'backup-appli':17B 'contain':33B,92C 'could':57B,113C 'cve':11A,14A 'data':3A,21B,29B,66C 'data-domain':20B 'dell':1A,23B,27B,64C 'directori':51B,102C 'domain':4A,22B,30B,67C 'exploit':115C 'featur':68C 'file':47B 'filesystem':9A,59B,120C 'flaw':37B 'gain':58B 'give':7A 'improp':94C 'infrastructur':24B 'intend':50B 'lead':118C 'let':39B 'limit':95C 'line':32B 'low':42B,107C 'low-privileg':41B 'lts2024':74C 'lts2025':80C 'lts2026':86C 'outsid':48B 'path':5A,35B,103C 'pathnam':98C 'potenti':114C 'powerprotect':2A,25B,28B,65C 'privileg':43B,108C 'reach':46B 'releas':31B,69C,75C,81C,87C 'remot':44B,111C 'restrict':101C 'say':54B 'sever':26B 'sourc':53B 'travers':6A,36B,104C 'user':45B 'version':70C,76C,82C,88C 'vulner':105C,117C","nicknames":[],"mitigations":[],"who_affected":"Organizations running Dell PowerProtect Data Domain appliances on the listed Feature Release or LTS versions with remote access enabled. Sites on other release lines, or with no remote access to the appliance, are less exposed; the sources do not say more.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-28T09:17:07+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"security_alert@emc.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-86398","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86398","severity":null,"published_at":"2026-10-28T09:17:07+00:00","modified_at":"2026-10-28T09:17:07+00:00","first_seen_at":"2026-10-28T09:32:03+00:00","fetched_at":"2026-10-28T09:32:03+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"}