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TI-2026-42592 Aliases CVE-2026-59723GHSA-3cj3-hqcr-g934

Cline: Cross-Origin WebSocket Hijacking in Cline Hub Dashboard (`/browser` endpoint)

Priority HIGH 73CWE-346Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-346.

Summary

Cline is an autonomous coding agent as an SDK, IDE extension, or CLI assistant. Prior to 3.0.30, the Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header, and when ROOM_SECRET is unset for local 127.0.0.1 binds, isAuthorizedBrowserRequest() allows attacker-controlled websites to send desktopCommand frames that read workspace state, mutate MCP and provider settings, and trigger command execution when a provider or model is configured. This issue is fixed in version 3.0.30.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00249 16th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed cline (cline): 3.0.30cline (npm): 3.0.30

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
clineclinebefore 3.0.303.0.30Patch availableCNA
—cline (npm)before 3.0.303.0.30Patch availableGHSA-3cj3-hqcr-g934
  • cline Vendorcline Affected before 3.0.30 Fixed in 3.0.30 Patch available CNA
  • cline (npm) Vendor— Affected before 3.0.30 Fixed in 3.0.30 Patch available GHSA-3cj3-hqcr-g934

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cline:cline:*:*:*:*:*:*:*:*before 3.0.30Vulnerablecline
  • cpe:2.3:a:cline:cline:*:*:*:*:*:*:*:* Versions before 3.0.30 Vulnerable ·cline

Remediation

  • Fix · CNA cline (cline) Fixed in 3.0.30
  • Fix · GHSA-3cj3-hqcr-g934 cline (npm) Fixed in 3.0.30 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59723
  2. 2026-10-03 Alias added: GHSA-3cj3-hqcr-g934

References

Exploit 1

Patch 2

Advisory 1

Other 2

  • TI-2026-32190 Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability CVSS 3.1CRITICAL 9.6
  • TI-2026-23512 DSAI-Cline's command auto-approval module contains a critical OS command injection… CVSS 3.1CRITICAL 9.8

Sources

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