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 available patches.

Vulnerability class: Broken Authentication

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.002 (10.1th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-44211: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

  • Cline — versions <= 2.13.0

Weakness classification (CWE)

References

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.