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CVE-2026-55676— Malcolm vulnerable to RCE via unrestricted .php upload to the file-upload component

Quick assessment

Affected
cisagov Malcolm
Exploitation
Public or AI PoC available; prioritize validation
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组织的一款网络流量与日志分析平台。 Cybersecurity and Infrastructure Security Agency Malcolm 26.06.1之前版本存在任意文件上传漏洞，该漏洞源于文件上传组件未正确限制文件类型，允许上传.php文件，可能导致经过身份验证的攻击者执行任意PHP

CVSS 8.8 · High EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell

Affected Version Matrix 2

VendorProduct Version RangeStatus
cisagov Malcolm < 26.06.1 affected
26.06.1 unaffected
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I. Basic Information for CVE-2026-55676

Vulnerability Information
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Vulnerability Title
Malcolm vulnerable to RCE via unrestricted .php upload to the file-upload component
Source: CVE Program / CVE List V5
Vulnerability Description
Malcolm is a network traffic analysis tool suite. The file-upload component (FilePond PHP backend) accepts uploads at `POST /server/php/submit.php` and stores them in a directory served by the same nginx and php-fpm instance. The allow-list that should restrict accepted file types is an empty array by default (`file-upload/php/config.php:16`), so the type check is a no-op and every extension is accepted. The filename sanitizer keeps the `.php` extension intact. Committed files land in `/var/www/upload/server/php/files` (`file-upload/php/config.php:7`), and the component's nginx routes any URL ending in `.php` to php-fpm. An authenticated `GET /server/php/files/<name>.php` then executes the uploaded code as `www-data`. Prior to version 26.06.1, in RBAC mode, the upload endpoint is reachable by the granular `ROLE_UPLOAD` role (`nginx/lua/nginx_auth_helpers.lua:71`), a role intended only for submitting capture files. As a result, a user holding the upload-only role runs arbitrary PHP as `www-data` inside the file-upload container. Version 26.06.1 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
Cybersecurity and Infrastructure Security Agency Malcolm 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cybersecurity and Infrastructure Security Agency Malcolm是Cybersecurity and Infrastructure Security Agency组织的一款网络流量与日志分析平台。 Cybersecurity and Infrastructure Security Agency Malcolm 26.06.1之前版本存在任意文件上传漏洞，该漏洞源于文件上传组件未正确限制文件类型，允许上传.php文件，可能导致经过身份验证的攻击者执行任意PHP
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 < 26.06.1 -

II. Public POCs for CVE-2026-55676

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8952 chars
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III. Intelligence Information for CVE-2026-55676

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Patches & Fixes for CVE-2026-55676 (1)

Vendor Advisories for CVE-2026-55676 (3)

Same Patch Batch · cisagov · 2026-08-11 · 4 CVEs total

CVE-2026-63177 7.1 HIGH Malcolm Vulnerable to Authorization Bypass via URI Normalization Differential in Nginx Lua
CVE-2026-63133 6.5 MEDIUM Malcolm has Uncontrolled Resource Consumption in Archive Extraction (Inode-Exhaustion DoS)
CVE-2026-63134 5.4 MEDIUM Malcolm's Path Traversal in Archive Extraction Allows Arbitrary Directory Creation

IV. Related Vulnerabilities

Same product: Malcolm
Same vendor: cisagov
Same weakness: CWE-434

V. Comments for CVE-2026-55676

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