High severity · published Oct 8, 2026
CVE-2026-107333
Incorrect Authorization in Malcolm
8.1
CVSS
1%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Malcolm · CISA
through 26.07.1 · source: vendor
In the news
VulnerabilityHigh
CISA Malcolm
View CSAF
Summary
The following versions of CISA Malcolm are affected:
Malcolm <=v26.07.1 (CVE-2026-107336, CVE-2026-107361, CVE-2026-107337, CVE-2026-107335, CVE-2026-107334)
Malcolm <=v26.08.0 (CVE-2026-107333, CVE-2026-107362)
CVSS
Vendor
Equipment
v3 8.1
CISA
Malcolm
6 Vulnerabilities
Authentication Bypass by Spoofing, Incorrect Authorization, Server-Side Request Forgery (SSRF), Authentication Bypass Using an Alternate Path or Channel, Cross-Site Request Forgery (CSRF), Improper Handling of Highly Compressed Data (Data Amplification)
Background
Critical Infrastructure Sectors: Energy, Information Technology, Water and Wastewater Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: United States
Vulnerabilities
Expand All +
CVE-2026-107336
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-s...
Oct 15, 2026·CISA Advisories
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107333
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107333
github.com
https://github.com/cisagov/Malcolm/security/advisories/GHSA-v66f-cwcm-hf73
government-resource
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-280-01.json
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CVE-2026-90456
Use of default credentials in Malcolm
7.1
CVE-2026-107337
Cross-Site Request Forgery in Malcolm
7.1
CVE-2026-107362
Server-Side Request Forgery in Malcolm
6.5
CVE-2026-107335
Improper Handling of Highly Compressed Data in Malcolm
