CVE-2025-8943 Unsupervised OS command execution leads to remote code execution by unauthenticated network attackers
Unauthenticated attackers can execute arbitrary OS commands via the Custom MCPs feature in Flowise, leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-8943?
CVE-2025-8943 is a critical command injection vulnerability in Flowiseai Flowise, published on 14 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Custom MCPs feature is designed to execute OS commands, for instance, using tools like `npx` to spin up local MCP Servers. However, Flowise's inherent authentication and authorization model is minimal and lacks role-based access controls (RBAC). Furthermore, in Flowise versions before 3.0.1 the default installation operates without authentication unless explicitly configured. This combination allows unauthenticated network attackers to execute unsandboxed OS commands.
Which versions are affected by CVE-2025-8943?
2 open source packages ship an affected version, including flowise. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
flowise npm | All versions to 3.0.5 | None |
flowise npm | All versions to 3.0.5 | None |
Products include Flowiseai Flowise.
How do I fix CVE-2025-8943?
No fix has been published for CVE-2025-8943 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2025-8943 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8943 exists.
Public exploit code: 1 Metasploit module and 1 Nuclei template.
Other vulnerabilities in Flowiseai Flowise
- CVE-2025-71338 Flowise through 2.2.7 - Arbitrary File Write to Remote Code Execution via document-store API
- CVE-2026-40933 Flowise: Authenticated RCE Via MCP Adapters
- CVE-2025-61913 Flowise is vulnerable to arbitrary file read, arbitrary file write
- CVE-2025-59528 Flowise has Remote Code Execution vulnerability
- CVE-2026-52098 Code injection in n/a
Sources
Also known as GHSA-2vv2-3x8x-4gv7.