{"id":"CVE-2026-126490","kind":"vulnerability","aliases":["CVE-2026-126490"],"related":[],"title":"OpenEMR: leftover debug code reveals web server Unix group memberships","description":"OpenEMR before 8.5.0 contains active debug code in interface/fax/fax_view.php that executes passthru(\"groups\") and discloses the web server's Unix group memberships. Authenticated attackers with fax module access can supply a nonexistent jid value to reveal groups such as adm or shadow, aiding privilege escalation planning.","summary":"OpenEMR versions before 8.5.0 contain debug code in the fax viewer that runs a system command and displays the web server's Unix group memberships. An attacker with fax module access can learn groups such as adm or shadow, which helps plan privilege escalation.","severity":"low","cvss":3.1,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"OpenEMR","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["healthcare","openemr","other","php","self-hosted"],"not_affected_if":["no-fax-module-access","openemr-8.5.0-or-later"],"how_to_check":"- Check the OpenEMR version in the installed application; versions before `8.5.0` are affected.\n- Look for `passthru(\"groups\")` in `interface/fax/fax_view.php`.","fix":"- OpenEMR: upgrade to `8.5.0` or later.","status":"open","published_at":"2026-11-13T10:17:59+00:00","first_seen_at":"2026-11-13T10:47:26+00:00","triaged_at":"2026-11-13T10:58:59+00:00","updated_at":"2026-11-13T10:58:59+00:00","category":"other","confidence":0.8,"triage":{"at":"2026-11-13T10:58:59Z","model":"claude-haiku-5-5","output":{"fix":"- OpenEMR: upgrade to `8.5.0` or later.","reach":"network","title":"OpenEMR: leftover debug code reveals web server Unix group memberships","impact":"low","summary":"OpenEMR versions before 8.5.0 contain debug code in the fax viewer that runs a system command and displays the web server's Unix group memberships. An attacker with fax module access can learn groups such as adm or shadow, which helps plan privilege escalation.","audience":"businesses","category":"other","nicknames":[],"who_cares":["openemr","healthcare","self-hosted","php"],"confidence":0.8,"fix_status":"available","needs_auth":"yes","worst_case":"attacker learns server group memberships to aid privilege escalation","analyst_note":"","how_to_check":"- Check the OpenEMR version in the installed application; versions before `8.5.0` are affected.\n- Look for `passthru(\"groups\")` in `interface/fax/fax_view.php`.","plain_action":"","product_name":"OpenEMR","needs_analyst":false,"not_affected_if":["openemr-8.5.0-or-later","no-fax-module-access"],"who_is_affected":"Sites running OpenEMR before 8.5.0 where users have access to the fax module. The exposed page is fax_view.php, and the flaw only discloses group names, not data, to logged-in users. Sites on 8.5.0 or later, or with no fax module access for users, are not exposed.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000738,"input_tokens":4610,"output_tokens":553,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-126490':13A,16A '-2026':12A,15A '8.5.0':28B,71C 'access':55B,96C 'activ':73C 'adm':61B,108C 'aid':111C 'attack':51B,92C 'authent':91C 'code':4A,31B,75C 'command':40B 'contain':29B,72C 'cve':11A,14A 'debug':3A,30B,74C 'disclos':83C 'display':42B 'escal':68B,113C 'execut':79C 'fax':34B,53B,94C 'group':9A,48B,58B,81C,89C,105C 'healthcar':18B 'help':65B 'host':24B 'interface/fax/fax_view.php':77C 'jid':101C 'learn':57B 'leftov':2A 'membership':10A,49B,90C 'modul':54B,95C 'nonexist':100C 'openemr':1A,17A,19B,25B,69C 'passthru':80C 'php':21B 'plan':66B,114C 'privileg':67B,112C 'reveal':5A,104C 'run':37B 'self':23B 'self-host':22B 'server':7A,45B,86C 'shadow':63B,110C 'suppli':98C 'system':39B 'unix':8A,47B,88C 'valu':102C 'version':26B 'viewer':35B 'web':6A,44B,85C","nicknames":[],"mitigations":[],"who_affected":"Sites running OpenEMR before 8.5.0 where users have access to the fax module. The exposed page is fax_view.php, and the flaw only discloses group names, not data, to logged-in users. Sites on 8.5.0 or later, or with no fax module access for users, are not exposed.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":["openemr"],"ptokens":["openemr"],"labels":["healthcare","low","openemr","other","php","selfhosted","vendor"],"campaign_type":null,"search_a":"'-126490':13A,16A '-2026':12A,15A 'code':4A 'cve':11A,14A 'debug':3A 'group':9A 'leftov':2A 'membership':10A 'openemr':1A,17A 'reveal':5A 'server':7A 'unix':8A 'web':6A","search_b":"'8.5.0':28B 'access':55B 'adm':61B 'attack':51B 'code':31B 'command':40B 'contain':29B 'debug':30B 'display':42B 'escal':68B 'fax':34B,53B 'group':48B,58B 'healthcar':18B 'help':65B 'host':24B 'learn':57B 'membership':49B 'modul':54B 'openemr':19B,25B 'php':21B 'plan':66B 'privileg':67B 'run':37B 'self':23B 'self-host':22B 'server':45B 'shadow':63B 'system':39B 'unix':47B 'version':26B 'viewer':35B 'web':44B","search_c":"'8.5.0':71C 'access':96C 'activ':73C 'adm':108C 'aid':111C 'attack':92C 'authent':91C 'code':75C 'contain':72C 'debug':74C 'disclos':83C 'escal':113C 'execut':79C 'fax':94C 'group':81C,89C,105C 'interface/fax/fax_view.php':77C 'jid':101C 'membership':90C 'modul':95C 'nonexist':100C 'openemr':69C 'passthru':80C 'plan':114C 'privileg':112C 'reveal':104C 'server':86C 'shadow':110C 'suppli':98C 'unix':88C 'valu':102C 'web':85C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-10-28T01:49:42+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/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-2026-126490","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126490","severity":null,"published_at":"2026-11-13T10:17:59+00:00","modified_at":"2026-11-13T10:17:59+00:00","first_seen_at":"2026-11-13T10:47:26+00:00","fetched_at":"2026-11-13T10:47:26+00:00","note":null}],"documents":[{"id":145223,"url":"https://github.com/openemr/openemr/security/advisories/GHSA-wc2f-fvpv-c32r","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-28T01:49:42+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":145224,"url":"https://www.vulncheck.com/advisories/openemr-before-8.5.0-information-disclosure-via-debug-code-in-fax-view-php","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"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"}