PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-59723 cline CVE debrief

The Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header. When ROOM_SECRET is unset for local 127.0.0.1 binds, isAuthorizedBrowserRequest() allows attacker-controlled websites to send desktopCommand frames that read workspace state, mutate MCP and provider settings, and trigger command execution when a provider or model is configured. This issue is fixed in version 3.0.30. The vulnerability affects Cline autonomous coding agent versions prior to 3.0.30 and has been addressed in the latest version.

Vendor
cline
Product
Unknown
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-08
Original CVE updated
2026-08-26
Advisory published
2026-07-08
Advisory updated
2026-08-26

Who should care

Users of Cline autonomous coding agent versions prior to 3.0.30 should update to the latest version to prevent potential attacks. This includes operators, administrators, and security teams responsible for managing and securing Cline deployments.

Technical summary

The Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header. When ROOM_SECRET is unset for local 127.0.0.1 binds, isAuthorizedBrowserRequest() allows attacker-controlled websites to send desktopCommand frames that read workspace state, mutate MCP and provider settings, and trigger command execution when a provider or model is configured. This issue is fixed in version 3.0.30 and affects Cline autonomous coding agent versions prior to 3.0.30.

Defensive priority

High

Recommended defensive actions

  • Update Cline autonomous coding agent to version 3.0.30 or later
  • Restrict WebSocket connections to only trusted origins
  • Monitor for suspicious desktopCommand frames
  • Implement additional security measures to prevent command execution
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-08T23:16:56.440Z and was last modified on 2026-07-10T19:17:58.040Z. The NVD entry is currently Undergoing Analysis. The Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header. When ROOM_SECRET is unset for local 127.0.0.1 binds, isAuthorizedBrowserRequest() allows attacker-controlled websites to send desktopCommand frames that read workspace state, mutate MCP and provider settings, and trigger command execution when a provider or model is configured. This issue is fixed in version 3.0.30.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-59723 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-59723

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-59723 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-59723

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.