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CISA KEV Alert — Active Real-World Exploitation Confirmed
This vulnerability is in the CISA Known Exploited Vulnerabilities catalog and is being actively exploited right now.
Langflow CORS Validation Authentication Token Theft (CVE-2025-34291) | MSSP Advisory
High🔴 KEV ALERT
DateMay 21, 2026
CVECVE-2025-34291
📋Executive Summary
CISA flagged CVE-2025-34291 in Langflow, a visual AI workflow platform, where broken CORS validation lets attackers steal authentication tokens through malicious web pages. Any MSSP using Langflow for client automation or AI workflows faces immediate credential theft risk and potential full system compromise.
⚠️Why It Matters for MSSPs
Your Langflow instances become entry points to client networks if attackers can steal your authentication tokens through simple web attacks. Clients building AI workflows through your managed Langflow deployments need immediate notification about this authentication bypass that could expose their entire automation stack.
✅Recommended Action
Audit all Langflow deployments across your stack and client environments within 24 hours. Apply vendor patches immediately or isolate Langflow instances from network access until patches are available. Send client notifications today about this vulnerability if they use Langflow for any AI or automation workflows.
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🏷️Threat Category
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