{"id":"CVE-2026-55676","revision":"5f1c4af2baa748ffa26925aa759c74b4","records":[{"revision":"5f1c4af2baa748ffa26925aa759c74b4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55676","aliases":[],"title":"Malcolm vulnerable to RCE via unrestricted .php upload to the file-upload component","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.","state":0,"publishedAt":"2026-08-11T20:24:50.803+00:00","modifiedAt":"2026-10-02T20:20:14.228+00:00","affected":[{"ecosystem":"Vendor product","name":"Malcolm","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"cisagov\",\n                    \"product\": \"Malcolm\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"< 26.06.1\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"26.06.1\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"},{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"}],"references":["https://github.com/cisagov/Malcolm/security/advisories/GHSA-8cvp-m7pg-qrp7","https://github.com/cisagov/Malcolm/releases/tag/v26.06.1","https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01","https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55676","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55676","identifiers":["CVE-2026-55676"]},"retained":false,"historicalAffected":[]}],"coverage":[]}