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CISA KEV: Langflow Langflow — Langflow Origin Validation Error Vulnerability

·Source: CISA KEV

Updated:

Executive Summary

Langflow contains an origin validation error vulnerability in which an overly permissive CORS configuration 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. This could allow the attacker to execute arbitrary code and achieve full system compromise via obtained tokens that permit access to authenticated endpoints.

Analysis

Langflow contains an origin validation error vulnerability in which an overly permissive CORS configuration 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. This could allow the attacker to execute arbitrary code and achieve full system compromise via obtained tokens that permit access to authenticated endpoints. Added to CISA Known Exploited Vulnerabilities catalog on 2026-05-21. Remediation due: 2026-06-04.

Indicators of Compromise (1)

CVE (1)
CVE-2025-34291
NVDMITRE CVE
Source Attribution

Originally published by CISA KEV on May 21, 2026. Verified by: CISA.

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