High · published November 20, 2025
⚠️ An infinite redirect loop is like a hamster wheel for your server! Just one wrong URL hit can spin your resources into chaos. 😅 Think of it like a phone call where you keep getting redirected to the same voicemail — no matter how many times you try, you can't reach the person you need. That's exactly what happens when the /optin endpoint in LimeSurvey 6.13.0 is accessed directly, leaving clients and servers stuck in a loop! This vicious loop can lead to Denial of Service (DoS), draining server or client resources until everything grinds to a halt. Imagine your website becoming so overwhelmed it can't serve any actual users, leaving them frustrated and your service degraded — absolutely devastating!
Think of it like a phone call where you keep getting redirected to the same voicemail — no matter how many times you try, you can't reach the person you need. That's exactly what happens when the /optin endpoint in LimeSurvey 6.13.0 is accessed directly, leaving clients and servers stuck in a loop! The vulnerability in LimeSurvey 6.13.0 causes an infinite HTTP redirect when the endpoint /optin is accessed directly, preventing the system from breaking out of the loop and consuming excessive resources.
This vicious loop can lead to Denial of Service (DoS), draining server or client resources until everything grinds to a halt. Imagine your website becoming so overwhelmed it can't serve any actual users, leaving them frustrated and your service degraded — absolutely devastating! To protect your service, patch LimeSurvey to the latest version immediately. Consider implementing rate limiting or input validation to prevent unauthorized access to the /optin endpoint. Regularly monitor your server's performance for signs of unusual activity! You've got this! By taking these steps, you can keep your server running smoothly and your users happy. 🛡️
| Product | Versions | Fixed in |
|---|---|---|
| limesurvey/limesurvey | all versions | — |