Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01
- https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6
FAQ
What is CVE-2026-19670?
CVE-2026-19670 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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, uplo...
How severe is CVE-2026-19670?
CVE-2026-19670 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-19670?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.