{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-107336","assignerOrgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","state":"PUBLISHED","assignerShortName":"icscert","dateReserved":"2026-10-07T18:31:15.966Z","datePublished":"2026-10-08T17:20:46.517Z","dateUpdated":"2026-10-14T19:39:35.096Z"},"containers":{"cna":{"providerMetadata":{"orgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","shortName":"icscert","dateUpdated":"2026-10-14T19:39:35.096Z"},"title":"Authentication Bypass by Spoofing in Malcolm","datePublic":"2026-10-07T19:02:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-290","description":"CWE-290 Authentication bypass by spoofing","type":"CWE"}]},{"descriptions":[{"lang":"en","cweId":"CWE-441","description":"CWE-441 Unintended Proxy or Intermediary","type":"CWE"}]},{"descriptions":[{"lang":"en","cweId":"CWE-863","description":"CWE-863 Incorrect Authorization","type":"CWE"}]}],"affected":[{"vendor":"CISA","product":"Malcolm","versions":[{"status":"affected","version":"0","lessThanOrEqual":"26.07.1","versionType":"custom"},{"status":"unaffected","version":"26.08.0"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"Malcolm's front nginx reverse proxy defines a \"Dashboards → Arkime shortcut\" location using a case-insensitive regex matcher but a case-sensitive rewrite. A request whose path segment is not exact-lowercase (for example /IDDASH2ARK/...) enters the location (the matcher fires) but evades the rewrite (no redirect is issued), so nginx falls through to the location's proxy_pass to the Arkime backend. That location is the one proxied location in the shipped config that does not include the per-location authentication file, so the request reaches Arkime unauthenticated. The same location also forwards a client-supplied X-Forwarded-User header un-overwritten, and Arkime is configured to trust X-Forwarded-User as the authenticated username — so an unauthenticated network caller can reach the Arkime backend while supplying a forged, auto-provisioned identity.","supportingMedia":[{"type":"text/html","base64":false,"value":"Malcolm's front nginx reverse proxy defines a \"Dashboards → Arkime shortcut\" location using a <strong>case-insensitive</strong> regex matcher but a <strong>case-sensitive</strong> <code>rewrite</code>. A request whose path segment is not exact-lowercase (for example <code>/IDDASH2ARK/...</code>) enters the location (the matcher fires) but evades the rewrite (no redirect is issued), so nginx falls through to the location's <code>proxy_pass</code> to the Arkime backend. That location is the one proxied location in the shipped config that does <strong>not</strong> include the per-location authentication file, so the request reaches Arkime unauthenticated. The same location also forwards a <strong>client-supplied <code>X-Forwarded-User</code> header un-overwritten</strong>, and Arkime is configured to trust <code>X-Forwarded-User</code> as the authenticated username — so an unauthenticated network caller can reach the Arkime backend while supplying a forged, auto-provisioned identity."}]}],"references":[{"url":"https://github.com/cisagov/Malcolm/security/advisories/GHSA-7j32-cf27-cp6h"},{"url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-280-01.json","tags":["government-resource"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":6.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"}}],"solutions":[{"lang":"en","value":"Update to version v26.08.0","supportingMedia":[{"type":"text/html","base64":false,"value":"Update to version v26.08.0"}]}],"credits":[{"lang":"en","value":"Seth Grover","type":"reporter"},{"lang":"en","value":"Santosh Kumar Puppala","type":"finder"}],"source":{"discovery":"INTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-08T19:07:14.526487Z","id":"CVE-2026-107336","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-08T19:07:23.845Z"}}]}}