CVE-2026-107333: CWE-863 Incorrect Authorization in CISA Malcolm
Description
Malcolm's nginx based reverse proxy contains a URL path normalization inconsistency between its Lua based role-based access control (RBAC) authorization layer and nginx's own request routing logic. An authenticated user can craft a specially formatted request path to bypass role-based restrictions and reach administrative or role gated endpoints they should not have access to. This affects all restricted paths protected by the RBAC authorization layer, including file upload, PHP server, htadmin, and authentication management interfaces.
CVSS v3.1
Score 8.1high
Affected software
CISA
Malcolm
pkg:github/cisagov/MalcolmRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Malcolm's reverse proxy uses nginx with a Lua-based RBAC authorization layer. Due to inconsistent URL path normalization between these components, an authenticated user can bypass role-based restrictions by crafting specially formatted request paths. This vulnerability affects all restricted paths protected by the RBAC layer, enabling unauthorized access to administrative and role-gated endpoints.
Potential Impact
An authenticated user with limited privileges can bypass role-based access controls to access sensitive administrative interfaces and restricted endpoints. This can lead to unauthorized disclosure and modification of sensitive data, as well as potential unauthorized administrative actions. The CVSS 3.1 score is 8.1 (high), reflecting high confidentiality and integrity impacts without availability impact.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the Malcolm reverse proxy to trusted users and networks, and monitor for suspicious activity related to crafted request paths targeting restricted endpoints.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- icscert
- Date Reserved
- 2026-10-07T18:31:15.966Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac7d49a2cdf04f6562c68ac
Added to database: 10/08/2026, 17:36:26 UTC
Last enriched: 10/08/2026, 17:48:28 UTC
Last updated: 10/08/2026, 21:45:57 UTC
Views: 7
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