Flowise - LFI (CVE-2025-71334)

CVE-2025-71334 is a critical arbitrary file access vulnerability in Flowise before 3.0.6, caused by insufficient validation of chatflow and chat identifiers. Unauthenticated remote attackers can exploit path traversal to read sensitive files or write arbitrary files through exposed API endpoints, potentially enabling remote code execution and full compromise of the affected server.

CrowdSec has been tracking this vulnerability and its exploits since 3rd of August 2026.

Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2025-71334 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2025-71334 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2025-71334 is currently experiencing high visibility and active exploitation across the internet.

Attackers target the /api/v1/chatflows endpoint with a JSON id containing directory traversal sequences such as ../../../../../../../../tmp. The crafted flowData embeds a data URI and filename, abusing insufficient path validation to write files outside the intended storage directory; requests commonly include Content-Type: application/json and x-request-from: internal.