{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93483","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","state":"PUBLISHED","assignerShortName":"mitre","dateReserved":"2026-09-18T04:33:42.990Z","datePublished":"2026-10-15T03:43:10.406Z","dateUpdated":"2026-10-19T18:42:25.087Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Znuny","repo":"https://github.com/znuny/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"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV4_0":{"Automatable":"YES","Recovery":"USER","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9.5,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","providerUrgency":"RED","subAvailabilityImpact":"LOW","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"LOW"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-348","description":"CWE-348 Use of Less Trusted Source","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","shortName":"mitre","dateUpdated":"2026-10-15T03:43:10.406Z"},"references":[{"url":"https://www.znuny.org/advisories"},{"url":"https://www.znuny.org/en/advisories/zsa-2026-14"}],"x_generator":{"engine":"CVE-Request-form 0.0.1"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:znuny:znuny:*:*:*:*:*:*:*:*","versionEndExcluding":"6.5.25"},{"vulnerable":true,"criteria":"cpe:2.3:a:znuny:znuny:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0.0","versionEndExcluding":"7.3.7"}]}]}]},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-19T18:36:30.445045Z","id":"CVE-2026-93483","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-19T18:42:25.087Z"}}]}}