CVE-2026-28726
📋 TL;DR
This vulnerability allows unauthorized access to sensitive information in Acronis Cyber Protect 17 due to improper access control mechanisms. It affects all users running versions before build 41186 on both Linux and Windows platforms. Attackers could potentially access protected data without proper authentication.
💻 Affected Systems
- Acronis Cyber Protect 17
⚠️ 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 compromise of sensitive backup data, configuration files, and credentials stored within Acronis Cyber Protect, potentially leading to data theft, ransomware deployment, or further network compromise.
Likely Case
Unauthorized access to backup metadata, configuration details, or limited sensitive information that could facilitate further attacks or reconnaissance.
If Mitigated
Minimal impact with proper network segmentation, access controls, and monitoring in place, though the vulnerability still presents an unnecessary attack surface.
🎯 Exploit Status
Exploitation requires some level of access to the system, but the vulnerability is in access control logic which typically has low exploitation complexity once initial access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Build 41186 or later
Vendor Advisory: https://security-advisory.acronis.com/advisories/SEC-8401
Restart Required: Yes
Instructions:
1. Download the latest version from Acronis official website. 2. Run the installer. 3. Follow on-screen upgrade instructions. 4. Restart the Acronis Cyber Protect service. 5. Verify the build number is 41186 or higher.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Acronis Cyber Protect management interfaces to only trusted administrative networks.
Enhanced Access Controls
allImplement strict firewall rules and network access controls to limit who can communicate with the Acronis Cyber Protect service.
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to isolate Acronis Cyber Protect from untrusted networks
- Enable detailed logging and monitoring for all access attempts to the Acronis Cyber Protect service
🔍 How to Verify
Check if Vulnerable:
Check the build number in Acronis Cyber Protect console under Help > About. If build number is lower than 41186, the system is vulnerable.Check Version:
On Windows: Check Help > About in Acronis Cyber Protect console. On Linux: Check the installed package version via package manager.Verify Fix Applied:
Verify the build number is 41186 or higher in the About dialog and test access controls with non-privileged accounts.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to Acronis Cyber Protect APIs or interfaces
- Access to sensitive data paths by non-admin users
- Failed authentication attempts followed by successful data access
Network Indicators:
- Unusual traffic patterns to Acronis Cyber Protect ports from non-admin IPs
- Data exfiltration from Acronis backup storage
SIEM Query:
source="acronis" AND (event_type="access_denied" OR event_type="unauthorized_access") AND severity>=medium