{"id":"CVE-2026-93483","revision":"5981d20fb6fe45f1ad28cd8944651e40","records":[{"revision":"5981d20fb6fe45f1ad28cd8944651e40","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93483","aliases":[],"title":"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 hea…","description":"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.","state":0,"publishedAt":"2026-10-15T03:43:10.406+00:00","modifiedAt":"2026-10-19T18:42:25.087+00:00","affected":[{"ecosystem":"Vendor product","name":"Znuny","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"product\": \"Znuny\",\n                    \"repo\": \"https://github.com/znuny/znuny\",\n                    \"vendor\": \"Znuny\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"6.5.25\",\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThan\": \"7.3.7\",\n                            \"status\": \"affected\",\n                            \"version\": \"7.0.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/AU:Y/R:U/RE:L/U:Red","score":9.5,"severity":"CRITICAL"}],"references":["https://www.znuny.org/advisories","https://www.znuny.org/en/advisories/zsa-2026-14"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93483","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93483","identifiers":["CVE-2026-93483"]},"retained":false,"historicalAffected":[]}],"coverage":[]}