How severe is CVE-2026-44211?

CVE-2026-44211 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-44211 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44211?

CVE-2026-44211 affects Cline. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44211?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-44211 have an EU (EUVD) identifier?

Yes. CVE-2026-44211 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33662.

When was CVE-2026-44211 published?

CVE-2026-44211 was published on 2026-06-01 and last updated on 2026-06-17.

CVE-2026-44211

CVE-2026-44211 is a critical-severity vulnerability in Cline with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33662
Weakness: CWE-306
Affected product: Cline
Published: 2026-06-01
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-44211?: CVE-2026-44211 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-44211 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44211?: CVE-2026-44211 affects Cline. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44211?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-44211 have an EU (EUVD) identifier?: Yes. CVE-2026-44211 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33662.
When was CVE-2026-44211 published?: CVE-2026-44211 was published on 2026-06-01 and last updated on 2026-06-17.

References

https://github.com/cline/cline/security/advisories/GHSA-5c57-rqjx-35g2

Affected products (1)

cpe:2.3:a:cline:cline:*:*:*:*:*:*:*:*

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