{"id":"CVE-2026-119409","kind":"vulnerability","aliases":["CVE-2026-119409"],"related":[],"title":"OPNsense: firmware mirror URL lets an admin-level user run commands as root","description":"OPNsense before 26.7.8 contains a command injection vulnerability that allows authenticated users with the System: Firmware privilege to execute commands as root by storing a malicious firmware mirror URL. Attackers can submit shell metacharacters through POST /api/core/firmware/set that opnsense-update evaluates with eval, and can also disable package signature verification through sed injection.","summary":"OPNsense before 26.7.8 lets a user with the System: Firmware privilege store a crafted firmware mirror URL that is evaluated by a shell update script. The attacker can execute commands as root and can disable package signature checks.","severity":"high","cvss":8.6,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["firewall","freebsd","infrastructure","opnsense"],"not_affected_if":["no-firmware-privilege-users","version-26.7.8-or-later"],"how_to_check":"- Check the installed OPNsense version in the web interface or with `opnsense-version`.\n- Review which accounts hold the System: Firmware privilege.","fix":"- OPNsense: move to `26.7.8` or later.","status":"open","published_at":"2026-10-30T12:16:37+00:00","first_seen_at":"2026-10-30T12:30:23+00:00","triaged_at":"2026-10-30T12:31:59+00:00","updated_at":"2026-10-30T12:31:59+00:00","category":"infrastructure","confidence":0.8,"triage":{"at":"2026-10-30T12:31:59Z","model":"claude-haiku-5-5","output":{"fix":"- OPNsense: move to `26.7.8` or later.","reach":"network","title":"OPNsense: firmware mirror URL lets an admin-level user run commands as root","impact":"high","summary":"OPNsense before 26.7.8 lets a user with the System: Firmware privilege store a crafted firmware mirror URL that is evaluated by a shell update script. The attacker can execute commands as root and can disable package signature checks.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["opnsense","firewall","freebsd"],"confidence":0.8,"fix_status":"available","needs_auth":"yes","worst_case":"Attacker runs commands as root on the firewall","analyst_note":"","how_to_check":"- Check the installed OPNsense version in the web interface or with `opnsense-version`.\n- Review which accounts hold the System: Firmware privilege.","plain_action":"","needs_analyst":false,"not_affected_if":["version-26.7.8-or-later","no-firmware-privilege-users"],"who_is_affected":"Any OPNsense firewall running a version before 26.7.8 where a user holds the System: Firmware privilege. Exposure depends on who can log in to the firewall administration interface, so limit that privilege to trusted administrators until the update is applied.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000657,"input_tokens":4148,"output_tokens":484,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-119409':17A,20A '-2026':16A,19A '/api/core/firmware/set':99C '26.7.8':27B,65C 'admin':8A 'admin-level':7A 'allow':72C 'also':109C 'attack':51B,92C 'authent':73C 'check':62B 'command':12A,54B,68C,82C 'contain':66C 'craft':38B 'cve':15A,18A 'disabl':59B,110C 'eval':106C 'evalu':44B,104C 'execut':53B,81C 'firewal':21B 'firmwar':2A,34B,39B,78C,89C 'freebsd':22B 'infrastructur':23B 'inject':69C,116C 'let':5A,28B 'level':9A 'malici':88C 'metacharact':96C 'mirror':3A,40B,90C 'opnsens':1A,24B,25B,63C,102C 'opnsense-upd':101C 'packag':60B,111C 'post':98C 'privileg':35B,79C 'root':14A,56B,84C 'run':11A 'script':49B 'sed':115C 'shell':47B,95C 'signatur':61B,112C 'store':36B,86C 'submit':94C 'system':33B,77C 'updat':48B,103C 'url':4A,41B,91C 'user':10A,30B,74C 'verif':113C 'vulner':70C","nicknames":[],"mitigations":[],"who_affected":"Any OPNsense firewall running a version before 26.7.8 where a user holds the System: Firmware privilege. Exposure depends on who can log in to the firewall administration interface, so limit that privilege to trusted administrators until the update is applied.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"first_public_at":"2026-10-30T12:16:37+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/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":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119409","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119409","severity":null,"published_at":"2026-10-30T12:16:37+00:00","modified_at":"2026-10-30T12:16:37+00:00","first_seen_at":"2026-10-30T12:30:23+00:00","fetched_at":"2026-10-30T12:30:23+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"}