Vulnerability · Published Mar 20, 2026 · Assigned by GitHub_M

CVE-2026-33081PinchTab has Blind SSRF via browser-side redirect bypass in /download URL validation

Medium 5.8

In plain English

A medium-severity server-side request forgery in pinchtab from pinchtab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.8Medium

Exploit odds (30 days)0.3%top 77.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/pinchtab/pinchtab	0.8.3	GHSA-qwxp-6qf9-wr4m
Go	github.com/pinchtab/pinchtab	0.8.3	GO-2026-4748

Affected products (as reported)

Vendor	Product	Versions
pinchtab	pinchtab	< 0.8.3

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

References

https://github.com/pinchtab/pinchtab/security/advisories/GHSA-qwxp-6qf9-wr4m x_refsource_CONFIRM
https://github.com/pinchtab/pinchtab/releases/tag/v0.8.3 x_refsource_MISC