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

Advisory record · `GHSA-3cj3-hqcr-g934`

- **Identifiers:** `GHSA-3cj3-hqcr-g934` · `CVE-2026-59723`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **Weakness (CWE):** [CWE-346](https://cwe.mitre.org/data/definitions/346.html)
- **Tags:** [CWE-346](https://agentprime.io/advisories/tag/cwe-346.md)
- **Published:** 24 Sept 2026
- **Updated:** 24 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 24 Sept 2026, 19:48 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `cline` (npm): affected `<3.0.30`; fixed in `3.0.30`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.8 High, CVSS 3.1: `CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0025, the 16th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 24 Sept 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-3cj3-hqcr-g934](https://github.com/advisories/GHSA-3cj3-hqcr-g934)
- [OSV: GHSA-3cj3-hqcr-g934](https://osv.dev/vulnerability/GHSA-3cj3-hqcr-g934)
- <https://github.com/cline/cline/security/advisories/GHSA-3cj3-hqcr-g934>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-59723>
- <https://github.com/cline/cline/pull/11724>
- <https://github.com/cline/cline/commit/d09270940f5746f288cfc4a5039b46a2f4d5d01e>
- <https://github.com/cline/cline>
- <https://github.com/cline/cline/releases/tag/cli-v3.0.30>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-3cj3-hqcr-g934>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-3cj3-hqcr-g934/>. Everything for agents: <https://agentprime.io/llms.txt>.