Actively exploited in the wild
Langflow Missing Authentication Vulnerability
Langflow - Langflow · Listed in the CISA KEV since 2025-05-05. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVE-2025-3248
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
Langflow versions prior to 1.3.0 are vulnerable to code injection via the /api/v1/validate/code endpoint. An unauthenticated remote attacker can execute arbitrary code by sending crafted HTTP requests.
Risk Assessment
The risk includes full server compromise, data theft, or service disruption without requiring authentication.
Recommendation
Upgrade Langflow to version 1.3.0 or later immediately. If upgrading is not possible, restrict access to the /api/v1/validate/code endpoint from untrusted networks.
Other vulnerabilities in Langflow
See all- CVE-2026-34046High
Langflow prior to version 1.5.1 had a security vulnerability that allowed authenticated users to access other users' flows without ownership checks. The issue stemmed from the lack of proper query filtering based on the `AUTO_LOGIN` setting.
- CVE-2026-55450Critical
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.9.1, unauthenticated users can upload unlimited amounts of data to the server, leading to space exhaustion. Additionally, the server response reveals the absolute path of the uploaded file, which constitutes an information leak.
- CVE-2026-55255HighActively exploited
In Langflow prior to 1.9.1, an IDOR vulnerability in the /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request.
- CVE-2026-42048Critical
Langflow, a tool for building and deploying AI agents, is vulnerable to Path Traversal in the Knowledge Bases API (DELETE /api/v1/knowledge_bases) prior to version 1.9.0. An attacker can exploit this flaw to delete arbitrary directories on the server.
- CVE-2026-33017Critical
Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allowed building public flows without requiring authentication, leading to the possibility of remote code execution by unauthorized users.
- CVE-2026-0770CriticalActively exploited
A vulnerability in Langflow allows remote code execution via the exec_globals parameter in the validate endpoint. An unauthenticated attacker can inject malicious code from an untrusted source.
- CVE-2026-21445Critical
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.7.0.dev45, multiple critical API endpoints in Langflow are missing authentication controls. The issue allows any unauthenticated user to access sensitive user conversation data, transaction histories, and perform destructive operations including message deletion. This affects endpoints handling personal data and system operations that should require proper authorization. Version 1.7.0.dev45 contains a patch.
- CVE-2025-34291HighActively exploited
A vulnerability in Langflow versions up to and including 1.6.9 enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie set as SameSite=None allows a malicious webpage to perform cross-origin requests with credentials and call the refresh endpoint. An attacker can obtain fresh access_token/refresh_token pairs for a victim session and use them to execute arbitrary code, leading to full system compromise.
- CVE-2026-55446High
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.0.19, an attacker could send a /api/v1/files/upload/ request without an authentication token/cookies, leading to the langflow app becoming unusable for all users for an indefinite amount of time.
- CVE-2026-55423Medium
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.7.0, the logout button does not clear the session, allowing the previous user to remain logged in unless another user explicitly logs in.
Original NVD description (English source)
Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.