Vulnerability · Published Jun 1, 2026 · Assigned by GitHub_M
CVE-2026-44211Cline Kanban Server has a Cross-Origin WebSocket Hijacking Vulnerability
Critical 9.6
In plain English
A critical-severity missing authentication in cline from cline. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
Severity (CVSS 3.1)9.6Critical
Exploit odds (30 days)0.2%top 92.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Cline is an autonomous coding agent as an SDK, IDE extension, or CLI assistant. In versions 2.13.0 and prior, there is a cross-origin WebSocket hijack vulnerability in Cline Kanban servers. At time of publication, there are no publicly available patches.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | cline | no fix listed | GHSA-5c57-rqjx-35g2 |
Affected products (as reported)
Weakness: CWE-306, CWE-1385 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References
- https://github.com/cline/cline/security/advisories/GHSA-5c57-rqjx-35g2 x_refsource_CONFIRM