Vulnerability in cline (CVE-2026-59723)
Summary
Vulnerability in cline (CVE-2026-59723). Successful exploitation can lead to full system takeover. Exploitable via Origin. Mitigation: upgrade to 3.0.30 or later.
Original description
The description as published by the source.
Cline is an autonomous coding agent as an SDK, IDE extension, or CLI assistant. Prior to 3.0.30, the Cline Hub dashboard server launched by the cline dashboard command accepts WebSocket connections on the /browser endpoint without validating the Origin header, and 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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-59723 has been found in cline.
Attackers can target a specific entry point like Origin over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade cline to 3.0.30 or later.
If unsure, ask your IT team or search "cline CVE-2026-59723" on the vendor's site.
CVE-2026-59723 (cline) — CWE-346 / CVSS v3 8.8
Attack vector: adjacent-network / unauthenticated
Attack surface: Origin / ROOM_SECRET / true / desktopCommand
Patched: 3.0.30 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-346) exists in cline. Attackers reach the vulnerable code path via Origin without authentication.
Check the vendor advisory for the affected versions of cline. Attack surface: Origin / ROOM_SECRET / true / desktopCommand.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to 3.0.30.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'cline' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'cline' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
clineを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade cline to 3.0.30ステージング環境で 3.0.30 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- patch github.com
- patch github.com
- web github.com
- web github.com