CISA Orders Federal Agencies to Prioritize Patching Langflow Auth Bypass Vulnerability

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CISA mandates federal agencies to address a critical Langflow vulnerability by Friday, highlighting risks from IDOR flaws and real-world exploitation.

CISA Mandates Action on Langflow Vulnerability

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has mandated that federal agencies address a critical vulnerability in the Langflow platform, which is used for developing AI agents, by a deadline set for Friday. This framework is widely utilized in AI development due to its user-friendly drag-and-drop interface for creating executable workflows and its REST API for programmatic execution.

Vulnerability Details: CVE-2026-55255

Designated as CVE-2026-55255, the Insecure Direct Object Reference (IDOR) vulnerability permits authenticated attackers to gain unauthorized access to other users’ workflows by transmitting a specially crafted request to the /api/v1/responses endpoint, leveraging the victim’s unique identifier (flow_id). Exploitation of this flaw allows adversaries to retrieve sensitive information processed by the affected workflows and to exploit the victim’s computational resources.

Real-World Exploitation

Sysdig’s Threat Research Team (TRT) identified the exploitation of CVE-2026-55255 in real-world scenarios starting June 25, noting that the primary goal was “code execution and the deployment of secondary implants (loader/dropper mechanisms).” The researchers observed that the attackers exhibited opportunistic behavior driven by financial incentives. They concluded that the primary motivation was monetary gain, achieved through the exploitation of compromised AI systems for their computational power (as part of botnets or implants) and their credentials (such as LLM or cloud keys), utilizing cost-effective and repetitive tools with minimal sophistication.

“code execution and the deployment of secondary implants (loader/dropper mechanisms)”

CISA’s KEV Catalog and Compliance Requirements

On Tuesday, CISA incorporated the CVE-2026-55255 authorization bypass into its Known Exploited Vulnerabilities Catalog (KEV), compelling U.S. Federal Civilian Executive Branch (FCEB) agencies to implement security measures by Friday, in accordance with Binding Operational Directive (BOD) 26-04. The agency emphasized that such vulnerabilities frequently serve as entry points for malicious actors, posing substantial risks to federal operations. It urged stakeholders to assess the internet exposure of their assets and comply with the patching requirements outlined in BOD 26-04.

Additional Vulnerabilities in Langflow

In addition, CISA included a Langflow authentication flaw (CVE-2025-3248) in its KEV catalog in May 2025 and a code injection vulnerability (CVE-2026-33017) in March 2026. The agency highlighted that the earlier vulnerability was exploited by ransomware groups, as reported by Sysdig, which linked the JadePuffer ransomware operation to the extraction of data from Langflow’s PostgreSQL database. Since June, malicious actors have also been leveraging a high-severity path traversal flaw (CVE-2026-5027) to inject arbitrary files onto vulnerable servers, as noted by VulnCheck researcher Caitlin Condon.