CVE-2021-43810 — AI Deep Analysis Summary

🚨 **Essence**: Reflected Cross-Site Scripting (XSS) in Admidio. 📉 **Consequences**: Attackers inject malicious scripts via the `url` parameter in `redirect.php`.…

🛡️ **Root Cause**: CWE-79 (Improper Neutralization of Input). 💥 **Flaw**: The `redirect.php` script fails to validate/sanitize the `url` parameter.…

👥 **Affected**: Admidio Team's open-source member management system. 📦 **Versions**: All versions **prior to 4.0.12**. ✅ **Fixed**: Version 4.0.12 and later are safe.

💻 **Capabilities**: Execute arbitrary JavaScript in the victim's browser. 🕵️ **Impact**: Steal cookies/session tokens, redirect users to phishing sites, or deface the page.…

⚖️ **Threshold**: Low. 🌐 **Network**: Attack Vector is Network (AV:N). 🔒 **Privileges**: No Privileges Required (PR:N). 🖱️ **User Interaction**: Required (UI:R) - victim must click a malicious link. AC is Low (AC:L).

🔓 **Exploit**: Yes. 📜 **PoC**: Public Nuclei template available via ProjectDiscovery. 🌍 **Status**: Known vulnerability with clear exploitation paths described in security advisories.

🔍 **Check**: Scan for Admidio instances. 🧪 **Test**: Craft a URL with a malicious payload in the `url` parameter of `redirect.php`.…

🛠️ **Fix**: Upgrade to **Admidio 4.0.12** or newer. 📥 **Source**: Official GitHub releases and security advisories (GHSA-3qgf-qgc3-42hh) confirm the patch is available.

🚧 **Workaround**: If patching is impossible, restrict access to `redirect.php`. 🛑 **Mitigation**: Implement strict input validation on the `url` parameter server-side or use a WAF to block XSS payloads in query strings.

🔥 **Priority**: HIGH. 📅 **Published**: Dec 2021. ⚠️ **Reason**: CVSS Score is High (7.5+ implied by H/H/H metrics). No auth required for network access. Immediate patching recommended for all exposed instances.