CVE-2026-44211
Cline versions 2.13.0 and earlier contain a cross-origin WebSocket hijack vulnerability in their Kanban servers. An attacker can exploit this flaw to hijack WebSocket connections, leading to high impacts on confidentiality, integrity, and availability. No official patches are currently available.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
Users of Cline (SDK, IDE extension, or CLI assistant) version 2.13.0 or prior.
Real-world impact
Successful exploitation could allow an attacker to read, modify, or disrupt data transmitted via the WebSocket channel, potentially compromising the integrity and availability of the affected system.
Why this severity
The CVSS base score of 9.6 (Critical) reflects a network‑adjacent attack with low complexity, no privileges required, and user interaction needed, resulting in high impacts across confidentiality, integrity, and availability.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- Jun 1, 2026 · Jun 1, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 22, 2026 · 13d agoAdvisory updatedThe NVD record was last revised.
How it’s attacked
References & advisories
- github.com/cline/cline/security/adviso…exploitmitigationvendor advisory