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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: A Cross-Site Scripting (XSS) flaw in Zimbra's Calendar Invite feature. 📧 **Consequences**: Attackers inject malicious payloads into calendar headers.…
🎯 **Affected Versions**:
• Zimbra Collaboration Server (ZCS) **9.0**
• Zimbra Collaboration Server (ZCS) **10.0**
📦 **Component**: The 'CalendarInvite' feature within the Classic Webmail Interface. 🖥️
Q4What can hackers do? (Privileges/Data)
💀 **Attacker Capabilities**:
• Execute **Arbitrary JavaScript** in the victim's context.
• Steal session cookies/tokens.
• Perform actions on behalf of the user (e.g., send emails, access contacts).…
🔓 **Exploitation Threshold**: **Low**. 📉 The attack vector is an **email message**. The attacker only needs to send a crafted email with a malicious calendar header.…
🔎 **Self-Check**:
1. Scan for Zimbra servers running v9.0 or v10.0.
2. Use Nuclei with the specific CVE-2024-27443 template.
3. Check if the 'Classic UI' is enabled.
4.…
✅ **Official Fix**: Yes. Patches are available.
• **ZCS 9.0**: Patched in version **P39**.
• **ZCS 10.0**: Patched in version **10.0.7**.
📥 Update immediately via official Zimbra release notes. 🔄
Q9What if no patch? (Workaround)
🚧 **No Patch Workaround**:
• Disable the **Classic Webmail UI** if possible (switch to New UI).
• Implement strict **Input Validation** on the server side for calendar headers.…
🔥 **Urgency**: **HIGH**. ⚡ XSS allows direct session hijacking and data theft. Since it triggers via email (a common attack vector), the risk of widespread compromise is significant.…