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.
Metrics
Affected Vendors & Products
Advisories
No advisories yet.
Fixes
Solution
Update to version v26.08.0
Workaround
No workaround given by the vendor.
References
History
Thu, 08 Oct 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Incorrect Authorization in Malcolm | |
| Weaknesses | CWE-863 | |
| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: icscert
Published:
Updated: 2026-10-08T19:04:45.258Z
Reserved: 2026-10-07T18:31:15.966Z
Link: CVE-2026-107334
No data.
Status : Received
Published: 2026-10-08T18:17:19.763
Modified: 2026-10-08T18:17:19.763
Link: CVE-2026-107334
No data.
OpenCVE Enrichment
Updated: 2026-10-08T18:30:07Z
Weaknesses