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Vulnerabilities

CVE-2024-27443

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability — Zimbra Collaboration contains a cross-site scripting (XSS) vulnerability in the CalendarInvite feature of the Zimbra
Published: May 19, 2025  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability — Zimbra Collaboration contains a cross-site scripting (XSS) vulnerability in the CalendarInvite feature of the Zimbra webmail classic user interface. An attacker can exploit this vulnerability via an email message containing a crafted calendar header, leading to the execution of arbitrary JavaScript code.

🤖 AI Executive Summary

Zimbra Collaboration Suite contains a critical XSS vulnerability in the CalendarInvite feature that allows attackers to execute arbitrary JavaScript through crafted calendar headers in email messages. This vulnerability affects the webmail classic interface and poses significant risk to organizations using Zimbra for email and collaboration.

📄 Description (Arabic)

تحتوي Zimbra Collaboration Suite على ثغرة XSS حرجة في ميزة CalendarInvite التي تسمح للمهاجمين بتنفيذ كود JavaScript عشوائي من خلال رسائل بريد إلكترونية تحتوي على رؤوس تقويم مصنوعة. يمكن للمهاجمين استخدام هذه الثغرة للوصول إلى بيانات المستخدمين الحساسة أو تثبيت برامج ضارة أو تنفيذ هجمات متقدمة. تؤثر الثغرة على واجهة webmail الكلاسيكية وتشكل خطراً كبيراً على المنظمات التي تعتمد على Zimbra.

🤖 ملخص تنفيذي (AI)

Zimbra Collaboration Suite يحتوي على ثغرة XSS حرجة في ميزة CalendarInvite تسمح للمهاجمين بتنفيذ كود JavaScript عشوائي من خلال رؤوس تقويم مصنوعة في رسائل البريد الإلكتروني. تؤثر هذه الثغرة على واجهة webmail الكلاسيكية وتشكل خطراً كبيراً على المنظمات التي تستخدم Zimbra للبريد الإلكتروني والتعاون.

🤖 AI Intelligence Analysis Analyzed: Apr 13, 2026 20:43
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: high
🏢 Affected Saudi Sectors
banking government telecom healthcare
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.0
/ 10.0
🔧 Remediation Steps (English)
Update Zimbra Collaboration Suite to the latest patched version immediately. Disable the CalendarInvite feature if updates are unavailable. Implement Web Application Firewall (WAF) rules to filter malicious calendar headers. Restrict email access to trusted sources and educate users about not clicking suspicious calendar invitations. Monitor email logs for suspicious calendar-related activities.
🔧 خطوات المعالجة (العربية)
قم بتحديث Zimbra Collaboration Suite إلى أحدث إصدار مصحح فوراً. قم بتعطيل ميزة CalendarInvite إذا لم تكن التحديثات متاحة. قم بتطبيق قواعد جدار حماية تطبيقات الويب (WAF) لتصفية رؤوس التقويم الضارة. قيد الوصول إلى البريد الإلكتروني من مصادر موثوقة وثقف المستخدمين حول عدم النقر على دعوات التقويم المريبة. راقب سجلات البريد الإلكتروني للأنشطة المريبة المتعلقة بالتقويم.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
2.1 2.2 3.1 3.2
🔵 SAMA CSF
ID.BE-5 PR.AC-1 PR.PT-1 DE.CM-1
🟡 ISO 27001:2022
A.6.1.1 A.13.1.1 A.13.1.3 A.14.2.1
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Synacor:Zimbra Collaboration Suite (ZCS)
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS30.11%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2025-06-09
Published 2025-05-19
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.0
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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