Sitecore XM, XC, und XP Post-Auth RCE via Zip Slip

The impact of CVE-2025-34510 is significant due to the potential for Remote Code Execution. A successful exploit allows an attacker, with authenticated access, to upload a crafted ZIP file containing path traversal sequences. This enables them to write arbitrary files to the server, potentially overwriting critical system files or injecting malicious code. The attacker could then execute this code, gaining complete control over the affected Sitecore instance. This could lead to data breaches, system compromise, and denial of service. The blast radius extends to any sensitive data processed or stored within the Sitecore environment, including customer information, content assets, and business-critical data.

Organizations heavily reliant on Sitecore Experience Manager for content management and digital experience delivery are at significant risk. This includes businesses using Sitecore for e-commerce, marketing automation, and customer relationship management. Specifically, deployments utilizing older versions (9.0-10.4) without robust file upload validation are particularly vulnerable. Shared hosting environments where multiple tenants share the same server infrastructure also face increased risk due to the potential for cross-tenant exploitation.

• .NET / Sitecore: Monitor Sitecore logs for unusual file upload activity, particularly attempts to write files outside of designated upload directories. Use PowerShell to check for unexpected files in sensitive locations.

Get-ChildItem -Path "C:\inetpub\wwwroot\sitecore\*" -Recurse -Filter "*.config"

• .NET / Sitecore: Examine web server access logs for HTTP POST requests to file upload endpoints with suspicious ZIP archive filenames or content. • .NET / Sitecore: Implement Windows Defender exploit mitigation rules to detect and prevent path traversal attacks. • .NET / Sitecore: Review Sitecore configuration files for any custom file upload handlers that might be vulnerable to path traversal.

1. 2025-06-17Disclosure

   disclosure

2. 2025-06-17Discovery

   discovery

3. 2025-06-17Patch

   patch

1. Reserviert2025-04-15
2. Veröffentlicht2025-06-17
3. Geändert2026-02-26
4. EPSS aktualisiert2026-03-23

The primary mitigation for CVE-2025-34510 is to upgrade to a patched version of Sitecore Experience Manager, XP, or XC. Sitecore has released updates to address this vulnerability. If immediate patching is not feasible, consider implementing temporary workarounds. These might include restricting file upload functionality, validating ZIP archive contents to prevent path traversal, and implementing stricter access controls to limit authenticated user privileges. Web Application Firewalls (WAFs) configured to detect and block malicious file uploads can also provide an additional layer of defense. After upgrading, confirm the fix by attempting to upload a ZIP archive containing a path traversal sequence and verifying that the upload is blocked or fails safely.