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CVE-2026-33622— A PinchTab Security Policy Bypass in /wait Allows Arbitrary JavaScript Execution

Quick assessment

Affected
pinchtab pinchtab
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

pinchtab是Pinchtab开源的一个AI代理浏览器控制工具。 PinchTab 0.8.3至0.8.5版本存在安全漏洞，该漏洞源于POST /wait端点绕过安全策略检查，可能导致任意JavaScript执行。

AI Predicted 7.5 Difficulty: Easy EPSS 0.53% · P45

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-33622

Vulnerability Information
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Vulnerability Title
A PinchTab Security Policy Bypass in /wait Allows Arbitrary JavaScript Execution
Source: CVE Program / CVE List V5
Vulnerability Description
PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. PinchTab `v0.8.3` through `v0.8.5` allow arbitrary JavaScript execution through `POST /wait` and `POST /tabs/{id}/wait` when the request uses `fn` mode, even if `security.allowEvaluate` is disabled. `POST /evaluate` correctly enforces the `security.allowEvaluate` guard, which is disabled by default. However, in the affected releases, `POST /wait` accepted a user-controlled `fn` expression, embedded it directly into executable JavaScript, and evaluated it in the browser context without checking the same policy. This is a security-policy bypass rather than a separate authentication bypass. Exploitation still requires authenticated API access, but a caller with the server token can execute arbitrary JavaScript in a tab context even when the operator explicitly disabled JavaScript evaluation. The current worktree fixes this by applying the same policy boundary to `fn` mode in `/wait` that already exists on `/evaluate`, while preserving the non-code wait modes. As of time of publication, a patched version is not yet available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
pinchtab 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pinchtab是Pinchtab开源的一个AI代理浏览器控制工具。 PinchTab 0.8.3至0.8.5版本存在安全漏洞，该漏洞源于POST /wait端点绕过安全策略检查，可能导致任意JavaScript执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pinchtab pinchtab >= 0.8.3, <= 0.8.5 -

II. Public POCs for CVE-2026-33622

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III. Intelligence Information for CVE-2026-33622

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Vendor Advisories for CVE-2026-33622 (1)

Same Patch Batch · pinchtab · 2026-03-26 · 5 CVEs total

CVE-2026-33623 6.7 MEDIUM PinchTab: OS Command Injection via Profile Name in Windows Cleanup Routine Enables Arbitra
CVE-2026-33621 4.8 MEDIUM PinchTab: Unapplied Rate Limiting Middleware Allows Unbounded Brute-Force of API Token
CVE-2026-33620 4.3 MEDIUM PinchTab: API Bearer Token Exposed in URL Query Parameter via Server Logs and Intermediary
CVE-2026-33619 4.1 MEDIUM PinchTab has Unauthenticated Blind SSRF in Task Scheduler via Unvalidated callbackUrl

IV. Related Vulnerabilities

Same product: pinchtab
Same vendor: pinchtab
Same weakness: CWE-94