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Vulnerabilities

CVE-2025-27915

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Synacor Zimbra Collaboration Suite XSS Vulnerability in ICS File Processing
Published: Oct 7, 2025  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability — Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that exists in the Classic Web Client due to insufficient sanitization of HTML content in ICS files. When a user views an e-mail message containing a malicious ICS entry, its embedded JavaScript executes via an ontoggle event inside a tag. This allows an attacker to run arbitrary JavaScript within the victim's session, potentially leading to unauthorized actions such as setting e-mail filters to redirect messages to an attacker-controlled address. As a result, an attacker can perform unauthorized actions on the victim's account, including e-mail redirection and data exfiltration.

🤖 AI Executive Summary

Synacor Zimbra Collaboration Suite contains a critical cross-site scripting vulnerability in the Classic Web Client that allows arbitrary JavaScript execution through malicious ICS files. Attackers can exploit this to perform unauthorized actions including email redirection and data exfiltration from victim accounts.

📄 Description (Arabic)

تحتوي Synacor Zimbra Collaboration Suite على ثغرة XSS حرجة في عميل الويب الكلاسيكي بسبب عدم كفاية تنظيف محتوى HTML في ملفات ICS. عندما يعرض المستخدم رسالة بريد إلكترونية تحتوي على إدخال ICS ضار، يتم تنفيذ JavaScript المضمن من خلال حدث ontoggle داخل علامة. يمكن للمهاجم تنفيذ إجراءات غير مصرح بها مثل إعادة توجيه رسائل البريد الإلكتروني إلى عنوان يتحكم به المهاجم أو استخراج البيانات الحساسة.

🤖 ملخص تنفيذي (AI)

Synacor Zimbra Collaboration Suite يحتوي على ثغرة حرجة في البرنامج النصي عبر الموقع في عميل الويب الكلاسيكي تسمح بتنفيذ JavaScript تعسفي من خلال ملفات ICS ضارة. يمكن للمهاجمين استغلال هذا لتنفيذ إجراءات غير مصرح بها بما في ذلك إعادة توجيه البريد الإلكتروني واستخراج البيانات من حسابات الضحايا.

🤖 AI Intelligence Analysis Analyzed: Apr 14, 2026 00:00
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: high
🏢 Affected Saudi Sectors
government banking telecom healthcare energy
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.0
/ 10.0
🔧 Remediation Steps (English)
Update Synacor Zimbra Collaboration Suite to the latest patched version immediately. Implement input validation and HTML sanitization for ICS file processing. Disable or restrict access to the Classic Web Client if patches are unavailable. Deploy web application firewalls to detect and block malicious ICS content. Conduct security awareness training on phishing and malicious email attachments.
🔧 خطوات المعالجة (العربية)
قم بتحديث Synacor Zimbra Collaboration Suite إلى أحدث إصدار مصحح على الفور. تطبيق التحقق من صحة الإدخال وتنظيف HTML لمعالجة ملفات ICS. تعطيل أو تقييد الوصول إلى عميل الويب الكلاسيكي إذا لم تكن التصحيحات متاحة. نشر جدران الحماية لتطبيقات الويب للكشف عن محتوى ICS الضار وحظره. إجراء تدريب على الوعي الأمني بشأن التصيد الاحتيالي والمرفقات البريدية الضارة.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.7.1.1 A.7.1.2 A.12.2.1 A.14.2.1
🔵 SAMA CSF
ID.BE-1 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
EPSS27.69%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2025-10-28
Published 2025-10-07
Source Feed cisa_kev
Views 2
🇸🇦 Saudi Risk Score
9.0
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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