CVE-2025-59026
📋 TL;DR
This is a cross-site scripting (XSS) vulnerability in Open-Xchange AppSuite where malicious file uploads can execute script code when users click attacker-controlled links. Attackers can perform actions as the victim user, potentially stealing sensitive data. All Open-Xchange AppSuite users are affected.
💻 Affected Systems
- Open-Xchange AppSuite
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, exfiltration of all user data including emails, contacts, and credentials, and lateral movement within the organization.
Likely Case
Session hijacking, theft of sensitive information from the user's account, and unauthorized actions performed in the user's name.
If Mitigated
Limited impact with proper content security policies, file upload restrictions, and user awareness training.
🎯 Exploit Status
Exploitation requires user interaction (clicking malicious link) and file upload capability. No public exploits are known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest security update from Open-Xchange
Vendor Advisory: https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2025/oxas-adv-2025-0003.json
Restart Required: Yes
Instructions:
1. Download the latest security update from Open-Xchange. 2. Apply the patch according to Open-Xchange deployment documentation. 3. Restart the AppSuite services. 4. Verify the update was successful.
🔧 Temporary Workarounds
Restrict file upload types
allConfigure the system to block potentially dangerous file types that could contain script code.
Implement Content Security Policy
allAdd CSP headers to prevent execution of inline scripts and restrict script sources.
🧯 If You Can't Patch
- Disable file upload functionality entirely if not required
- Implement strict file type validation and sanitization for all uploads
🔍 How to Verify
Check if Vulnerable:
Check if your Open-Xchange AppSuite version is older than the patched version released in the security advisory.Check Version:
Check Open-Xchange AppSuite administration interface or consult deployment documentation for version checking.Verify Fix Applied:
Verify that the AppSuite version matches or exceeds the patched version specified in the security advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual file upload patterns
- Multiple failed upload attempts
- Suspicious file types being uploaded
Network Indicators:
- Unexpected outbound connections after file uploads
- Data exfiltration patterns
SIEM Query:
source="open-xchange" AND (event="file_upload" AND file_type IN ("html", "svg", "xml"))