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CVE-2025-34291— Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE

Quick assessment

Affected
Langflow Langflow
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Langflow是Langflow开源的一个用于构建多代理和 RAG 应用程序的可视化框架。 Langflow 1.6.9及之前版本存在访问控制错误漏洞，该漏洞源于过度宽松的CORS配置和SameSite设置不当，可能导致账户接管和远程代码执行。

AI Predicted 10.0 Difficulty: Easy KEV EPSS 83.84% · P100

Public Exploits 1

Nuclei · 1 CVE-2025-34291.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
Langflow Langflow ≤ 1.6.9 affected
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I. Basic Information for CVE-2025-34291

Vulnerability Information
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Vulnerability Title
Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE
Source: CVE Program / CVE List V5
Vulnerability Description
Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Langflow 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Langflow是Langflow开源的一个用于构建多代理和 RAG 应用程序的可视化框架。 Langflow 1.6.9及之前版本存在访问控制错误漏洞，该漏洞源于过度宽松的CORS配置和SameSite设置不当，可能导致账户接管和远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Langflow Langflow 0 ~ 1.6.9 -

II. Public POCs for CVE-2025-34291

# POC Description Source Link Shenlong Link
1 Langflow AI versions 1.6.9 and earlier are vulnerable to a CORS misconfiguration that allows any origin to make credentialed requests. Combined with SameSite=None cookies, this enables cross-origin token theft and subsequent remote code execution via the /api/v1/validate/code endpoint. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-34291.yaml POC Details
2 None https://github.com/Threekiii/Awesome-POC/blob/master/%E4%BA%BA%E5%B7%A5%E6%99%BA%E8%83%BD%E6%BC%8F%E6%B4%9E/Langflow%20%E2%89%A4%201.6.9%20CORS%20%E9%85%8D%E7%BD%AE%E9%94%99%E8%AF%AF%E5%AF%BC%E8%87%B4%E4%BB%A4%E7%89%8C%E5%8A%AB%E6%8C%81%E5%92%8C%E8%BF%9C%E7%A8%8B%E5%91%BD%E4%BB%A4%E6%89%A7%E8%A1%8C%E6%BC%8F%E6%B4%9E%20CVE-2025-34291.md POC Details
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III. Intelligence Information for CVE-2025-34291

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Security Blog Posts for CVE-2025-34291 (1)

IV. Related Vulnerabilities

Same product: Langflow
Same vendor: Langflow
Same weakness: CWE-346

V. Comments for CVE-2025-34291

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