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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: Arbitrary File Upload flaw in Modern Events Calendar Lite. 📉 **Consequences**: Attackers can upload malicious files (e.g., PHP shells) leading to **Remote Code Execution (RCE)**.…
🛡️ **CWE-434**: Unrestricted Upload of File with Dangerous Type. 🐛 **Flaw**: The plugin fails to properly validate imported files. 🚫 No checks on file type or content before saving.
Q3Who is affected? (Versions/Components)
📦 **Product**: WordPress Plugin: Modern Events Calendar Lite. 📅 **Affected Versions**: **Before 5.16.5**. ✅ **Fixed**: Version 5.16.5 and later.
Q4What can hackers do? (Privileges/Data)
💻 **Action**: Upload & Execute PHP code. 🔑 **Privileges**: Requires **Authenticated** access (Admin/High-privilege). 📂 **Data**: Full control over the server environment. 🕵️♂️ Can run arbitrary commands.
Q5Is exploitation threshold high? (Auth/Config)
⚠️ **Threshold**: Medium. 🔐 **Auth Required**: Yes, needs Admin or high-privilege login. 📤 **Method**: Upload via 'text/csv' content-type trick. 🚧 Not fully unauthenticated, but admin access is often easier to obtain.
Q6Is there a public Exp? (PoC/Wild Exploitation)
🔓 **Public Exp?**: YES. 📂 **PoC**: Available on GitHub (dnr6419). 🧪 **Scanner**: Nuclei templates exist. 🌐 **Active**: Proof-of-concept code is public.
Q7How to self-check? (Features/Scanning)
🔍 **Check**: Scan for plugin version < 5.16.5. 📡 **Tool**: Use Nuclei or WPScan. 📝 **Indicator**: Look for 'modern-events-calendar-lite' directory. 🚨 **Alert**: If version is old, flag immediately.
Q8Is it fixed officially? (Patch/Mitigation)
🛠️ **Fix**: Upgrade to **v5.16.5+**. 🔄 **Action**: Update plugin via WordPress dashboard. ✅ **Status**: Official patch released. 📅 **Date**: March 2021.