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TI-2026-26002 Aliases CVE-2026-33620GHSA-mrqc-3276-74f8

PinchTab: API Bearer Token Exposed in URL Query Parameter via Server Logs and Intermediary Systems

Priority MEDIUM 53CWE-598Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00284 20th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed pinchtab (pinchtab): 0.8.4github.com/pinchtab/pinchtab (Go): 0.8.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
pinchtabpinchtab0.7.8 to before 0.8.40.8.4Patch availableCNA
—github.com/pinchtab/pinchtab (Go)0.7.8 to before 0.8.40.8.4Patch availableGHSA-mrqc-3276-74f8
  • pinchtab Vendorpinchtab Affected 0.7.8 to before 0.8.4 Fixed in 0.8.4 Patch available CNA
  • github.com/pinchtab/pinchtab (Go) Vendor— Affected 0.7.8 to before 0.8.4 Fixed in 0.8.4 Patch available GHSA-mrqc-3276-74f8

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:pinchtab:pinchtab:*:*:*:*:*:*:*:*0.7.8 to before 0.8.4Vulnerablepinchtab
  • cpe:2.3:a:pinchtab:pinchtab:*:*:*:*:*:*:*:* Versions 0.7.8 to before 0.8.4 Vulnerable ·pinchtab

Remediation

  • Fix · CNA pinchtab (pinchtab) Fixed in 0.8.4
  • Fix · GHSA-mrqc-3276-74f8 github.com/pinchtab/pinchtab (Go) Fixed in 0.8.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33620
  2. 2026-10-03 Alias added: GHSA-mrqc-3276-74f8

References

Exploit 1

Advisory 1

Other 2

  • TI-2026-23663 PinchTab: SSRF with Full Response Exfiltration via Download Handler CVSS 3.1HIGH 7.5
  • TI-2026-26005 PinchTab: OS Command Injection via Profile Name in Windows Cleanup Routine Enables Arbitrary Command Execution CVSS 3.1HIGH 7.2
  • TI-2026-26003 PinchTab: Unapplied Rate Limiting Middleware Allows Unbounded Brute-Force of API Token CVSS 3.1MEDIUM 6.5
  • TI-2026-26004 A PinchTab Security Policy Bypass in /wait Allows Arbitrary JavaScript Execution CVSS 4.0MEDIUM 6.1
  • TI-2026-26001 PinchTab has Unauthenticated Blind SSRF in Task Scheduler via Unvalidated callbackUrl CVSS 3.1MEDIUM 5.5
  • TI-2026-25523 PinchTab has Blind SSRF via browser-side redirect bypass in /download URL validation CVSS 3.1MEDIUM 5.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences