{"schema":"threatline.record/2","record":{"id":"CVE-2026-93483","aliases":[],"summary":"In Znuny through 7.3.6, an attacker can bypass specific standard login procedures and gain unauthorized access to sensitive system functions by manipulating a specific HTTP request header. Because the","details":"In Znuny through 7.3.6, an attacker can bypass specific standard login procedures and gain unauthorized access to sensitive system functions by manipulating a specific HTTP request header. Because the application incorrectly trusts this header, an attacker can impersonate any user, including administrators, without requiring a password. This grants full access to confidential data and system controls. More specifically, the HTTPBasicAuth modules for the agent (Kernel::System::Auth::HTTPBasicAuth) and customer (Kernel::System::CustomerAuth::HTTPBasicAuth) interfaces read the username to log in not only from $ENV{REMOTE_USER} (set by the web server after successful authentication), but also, as a fallback, from $ENV{HTTP_REMOTE_USER}, which is populated directly from an attacker-controllable \"Remote-User\" request header. On systems where HTTPBasicAuth was configured as the authentication backend, this allowed an attacker to log in as any existing user by sending a request with a forged Remote-User header, without providing any credentials.","categories":["Unclassified"],"product":"Znuny","vendor":"Znuny","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93483","source_modified_at":"2026-10-19T18:42:25.087Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Znuny","vendor":"Znuny","versions":[{"lessThan":"6.5.25","status":"affected","version":"0","versionType":"semver"},{"lessThan":"7.3.7","status":"affected","version":"7.0.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93483","source_modified_at":"2026-10-19T18:42:25.087Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Znuny","ecosystem":null},"version":"6.5.25","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93483","source_modified_at":"2026-10-19T18:42:25.087Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Znuny","ecosystem":null},"version":"7.3.7","basis":"first unaffected version stated in the CVE record"}],"cvss":9.5,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00234,"percentile":0.13502,"score_date":"2026-10-23"},"published_at":"2026-10-15T03:43:10.406Z","modified_at":"2026-10-19T18:42:25.087Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93483","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T18:42:25.087Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93483","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://www.znuny.org/advisories"},{"source":"CVE List","url":"https://www.znuny.org/en/advisories/zsa-2026-14"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-19T18:36:30.445045Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-19T18:42:25.087Z","content_hash":"66a529f2649887199f2dff87962306179438b4dfe2cb71bbe9159b61dc6876a6"}}