PinchTab up to 0.8.2 Internal Service /download validateDownloadURL server-side request forgery

Summaryinfo

A vulnerability was found in PinchTab up to 0.8.2. It has been classified as critical. Impacted is the function validateDownloadURL of the file /download of the component Internal Service. The manipulation leads to server-side request forgery. This vulnerability is traded as CVE-2026-33081. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in PinchTab up to 0.8.2 and classified as critical. This issue affects the function validateDownloadURL of the file /download of the component Internal Service. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. Versions 0.8.2 and below have a Blind SSRF vulnerability in the /download endpoint. The validateDownloadURL() function only checks the initial user-supplied URL, but the embedded Chromium browser can follow attacker-controlled redirects/navigations to internal network addresses after validation. Exploitation requires security.allowDownload=true (disabled by default), limiting real-world impact. An attacker-controlled page can use JavaScript redirects or resource requests to make the browser reach internal services from the PinchTab host, resulting in a blind Server-Side Request Forgery (SSRF) condition against internal-only services. The issue has been patched in version 0.8.3.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-33081 since 03/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 0.8.3 eliminates this vulnerability.

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Productinfo

Name

• PinchTab

Version

• 0.8.0
• 0.8.1
• 0.8.2

Website

• Product: https://github.com/pinchtab/pinchtab/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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