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CVE-2026-19670— Incorrect Authorization in CISA Malcolm

Quick assessment

Affected
CISAgov Malcolm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cybersecurity and Infrastructure Security Agency Malcolm是Cybersecurity and Infrastructure Security Agency政府部门的一款网络流量与日志分析平台。 Cybersecurity and Infrastructure Security Agency Malcolm 26.07.1及之前版本存在授权问题漏洞，该漏洞源于nginx Lua基于角色的访问控制层未对请求URI进行百分号解码，导致权限绕过，可能允许低权

CVSS 5.4 · Medium EPSS 0.17% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
CISAgov Malcolm ≤ 26.07.1 affected
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I. Basic Information for CVE-2026-19670

Vulnerability Information
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Vulnerability Title
Incorrect Authorization in CISA Malcolm
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Cybersecurity and Infrastructure Security Agency Malcolm 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cybersecurity and Infrastructure Security Agency Malcolm是Cybersecurity and Infrastructure Security Agency政府部门的一款网络流量与日志分析平台。 Cybersecurity and Infrastructure Security Agency Malcolm 26.07.1及之前版本存在授权问题漏洞，该漏洞源于nginx Lua基于角色的访问控制层未对请求URI进行百分号解码，导致权限绕过，可能允许低权
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
CISAgov Malcolm 0 ~ 26.07.1 -

II. Public POCs for CVE-2026-19670

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III. Intelligence Information for CVE-2026-19670

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Vendor Advisories for CVE-2026-19670 (2)

IV. Related Vulnerabilities

Same product: Malcolm
Same vendor: CISAgov
Same weakness: CWE-863

V. Comments for CVE-2026-19670

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