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Vulnerability record · CVE-2026-59723 · published 8 July 2026

CVE-2026-59723: Cline origin validation error vulnerability

Cline · Cline

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.

8.8 CVSS 3.1 High EPSS 0.25% · top 85.5% CWE-346 · Origin validation error
8.8CVSS 3.1 base score
0.25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
26 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/cline/cline/commit/d09270940f5746f288cfc4a5039b46a2f4d5d01e Patch
https://github.com/cline/cline/pull/11724 Issue TrackingPatch
https://github.com/cline/cline/releases/tag/cli-v3.0.30 Release Notes
https://github.com/cline/cline/security/advisories/GHSA-3cj3-hqcr-g934 ExploitVendor Advisory
https://github.com/cline/cline/security/advisories/GHSA-3cj3-hqcr-g934 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-59723), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.