{"id":"CVE-2026-19670","state":"PUBLISHED","title":"Incorrect Authorization in CISA Malcolm","description":"Malcolm's nginx Lua role-based access control (RBAC) layer decides whether an authenticated user may reach a role-restricted path (e.g. /htadmin, /auth, /admin_login, /arkime/api/esadmin, NetBox, upload endpoints) by pattern-matching the raw, percent-encoded request URI. Nginx itself, however, selects which location block actually serves the request using the percent-decoded, normalized URI. Because the RBAC check never percent-decodes its input, an authenticated low-privilege user can request an admin-only path using percent-encoding (e.g. /%68tadmin.php) and have nginx route it to the restricted location while the Lua RBAC gate evaluating the un-decoded raw string finds no matching restriction and grants access.","publishedAt":"2026-08-18T19:06:44.659Z","updatedAt":"2026-08-18T19:47:33.551Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","source":"icscert"},"assigner":"icscert","products":["CISAgov Malcolm"],"affected":[{"vendor":"CISAgov","product":"Malcolm","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"26.07.1","versionType":"custom"}]}],"references":["https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01","https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/19xxx/CVE-2026-19670.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-19670","state":"PUBLISHED","datePublished":"2026-08-18T19:06:44.659Z","dateUpdated":"2026-08-18T19:47:33.551Z","assignerShortName":"icscert","assignerOrgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateReserved":"2026-08-12T21:15:02.239Z"},"containers":{"cna":{"title":"Incorrect Authorization in CISA Malcolm","descriptions":[{"lang":"en","value":"Malcolm's nginx Lua role-based access control (RBAC) layer decides whether an authenticated user may reach a role-restricted path (e.g. /htadmin, /auth, /admin_login, /arkime/api/esadmin, NetBox, upload endpoints) by pattern-matching the raw, percent-encoded request URI. Nginx itself, however, selects which location block actually serves the request using the percent-decoded, normalized URI. Because the RBAC check never percent-decodes its input, an authenticated low-privilege user can request an admin-only path using percent-encoding (e.g. /%68tadmin.php) and have nginx route it to the restricted location while the Lua RBAC gate evaluating the un-decoded raw string finds no matching restriction and grants access."}],"affected":[{"vendor":"CISAgov","product":"Malcolm","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"26.07.1","versionType":"custom"}]}],"references":[{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01","tags":["government-resource"]},{"url":"https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":5.3,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":5.4,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"}},{"other":{"type":"ssvc","content":{"options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CNA","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863 Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"icscert","orgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateUpdated":"2026-08-18T19:06:44.659Z"},"solutions":[{"lang":"en","value":"Malcolm version 26.08.0 addresses this issue. For more information, see  https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6 .","supportingMedia":[{"type":"text/html","base64":false,"value":"Malcolm version 26.08.0 addresses this issue. For more information, see&nbsp;<a href=\"https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6\" target=\"_blank\">https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6</a>.&nbsp;"}]}],"credits":[{"lang":"en","value":"tinyb0y","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-18T19:46:12.178749Z","id":"CVE-2026-19670","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-18T19:47:33.551Z"}}]}}}