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CVE-2025-48700
CISA KEV
high
[KEV] Cross-Site Scripting (XSS) in Synacor zimbra-collaboration-suite-zcs (CVE-2025-48700)
Summary
cross-site scripting in Synacor zimbra-collaboration-suite-zcs (CVE-2025-48700). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited.
AI summary openai / gpt-4o
A serious vulnerability has been found in Synacor Zimbra Collaboration Suite (ZCS) which allows attackers to execute malicious scripts in users' browsers. This could lead to leakage of personal and sensitive data. Exploitation of this vulnerability has been confirmed, so it is crucial to review system settings and apply updates swiftly. Refer to the official security advisories for detailed version and patch information.
CVE-2025-48700 is a cross-site scripting (XSS) vulnerability in Synacor Zimbra Collaboration Suite (ZCS). While specific vulnerable endpoints and parameters are not disclosed, attackers could execute arbitrary JavaScript within a user's session. This vulnerability is included in CISA KEV, indicating it can be exploited remotely without user interaction. Updates on software patches and workarounds are awaited from official channels.
❓ What is the problem
Cross-site scripting vulnerability allowing JavaScript execution in user sessions.
📍 Affected scope
Not specified in available materials.
🔥 Severity
High severity due to potential unauthorized access to sensitive information, exploitation is confirmed.
🔧 How to fix
No patch version provided yet.
🛡️ Workaround
No workaround specified in available materials.
🔍 Detection
Further details required from monitoring tools or updated advisory.
Related past incidents Similar incidents extracted from past CVEs
A similar XSS vulnerability in Zimbra Collaboration Suite leading to information leakage.
Both involve vulnerabilities leading to unauthorized access to sensitive data.
Example of another XSS that affected email systems allowing script execution in user sessions.
If this happens at your company Expected impact per business scenario
📌 企業内部システムを利用している場合
内部情報に不正アクセスされ、データ漏洩リスクが増大。
📌 Webベースの顧客ポータルを提供している場合
顧客の個人情報が漏洩し、ブランドイメージが傷つけられる可能性。
📌 クラウドサービスとしてZCSを利用している場合
複数テナント間で情報の漏洩が発生し、顧客信頼が低下。
Recommended action
セキュリティチームは早急にシステム脆弱性管理を行い、ベンダーからの最新情報に対応すること。
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'zimbra-collaboration-suite-zcs' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `zimbra-collaboration-suite-zcs` を grep し、稼働しているサービス・バージョンを把握する。
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4Consider incident declaration escalate
Notify SOC / on-callCISA KEV登録済 = 実環境で悪用が観測されている。Step 3 で兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- advisory NVD