What is CVE-2026-44211?

CVE-2026-44211 is a critical-severity vulnerability in Cline, classified under Missing Authentication for Critical Function. CVSS score: 9.6/10. Published 2026-06-01.

How severe is CVE-2026-44211?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Auth bypass in Cline

CVE-2026-44211

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 ava…

Vulnerability class: Broken Authentication

EPSS: 0.000 (5.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Cline — versions <= 2.13.0

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function
CWE-1385

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44211?: CVE-2026-44211 is a critical-severity vulnerability in Cline, classified under Missing Authentication for Critical Function. CVSS score: 9.6/10. Published 2026-06-01.
How severe is CVE-2026-44211?: Critical severity. CVSS v3 base score is 9.6 out of 10.