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CVE-2026-33620— PinchTab: API Bearer Token Exposed in URL Query Parameter via Server Logs and Intermediary Systems

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 0.7.8至0.8.3版本存在安全漏洞，该漏洞源于通过URL查询参数传输API令牌，可能导致凭据泄露。

CVSS 4.3 · Medium EPSS 0.28% · P21

Possible ATT&CK Techniques 1 AI

T1552 · Unsecured Credentials
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I. Basic Information for CVE-2026-33620

Vulnerability Information
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Vulnerability Title
PinchTab: API Bearer Token Exposed in URL Query Parameter via Server Logs and Intermediary Systems
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 `v0.7.8` through `v0.8.3` accepted the API token from a `token` URL query parameter in addition to the `Authorization` header. When a valid API credential is sent in the URL, it can be exposed through request URIs recorded by intermediaries or client-side tooling, such as reverse proxy access logs, browser history, shell history, clipboard history, and tracing systems that capture full URLs. This issue is an unsafe credential transport pattern rather than a direct authentication bypass. It only affects deployments where a token is configured and a client actually uses the query-parameter form. PinchTab's security guidance already recommended `Authorization: Bearer <token>`, but `v0.8.3` still accepted `?token=` and included first-party flows that generated and consumed URLs containing the token. This was addressed in v0.8.4 by removing query-string token authentication and requiring safer header- or session-based authentication flows.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过GET请求中的查询字符串导致的信息暴露
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 0.7.8至0.8.3版本存在安全漏洞，该漏洞源于通过URL查询参数传输API令牌，可能导致凭据泄露。
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 >= 0.7.8, < 0.8.4 -

II. Public POCs for CVE-2026-33620

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III. Intelligence Information for CVE-2026-33620

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Vendor Advisories for CVE-2026-33620 (1)

Other References for CVE-2026-33620 (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-2026-33619 4.1 MEDIUM PinchTab has Unauthenticated Blind SSRF in Task Scheduler via Unvalidated callbackUrl
CVE-2026-33622 A PinchTab Security Policy Bypass in /wait Allows Arbitrary JavaScript Execution

IV. Related Vulnerabilities

Same product: pinchtab
Same vendor: pinchtab
Same weakness: CWE-598