CVE-2026-23572
📋 TL;DR
This vulnerability allows authenticated TeamViewer users to bypass the 'Allow after confirmation' security setting during remote sessions. Attackers who have valid credentials can gain unauthorized access without waiting for local user confirmation. All TeamViewer Full and Host clients on Windows, macOS, and Linux are affected.
💻 Affected Systems
- TeamViewer Full
- TeamViewer Host
⚠️ 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 system compromise by authenticated attackers who bypass all remote access controls, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Unauthorized access to systems by attackers with stolen or compromised TeamViewer credentials, enabling data exfiltration or lateral movement within networks.
If Mitigated
Limited impact if strong authentication controls, network segmentation, and monitoring are in place to detect unusual TeamViewer activity.
🎯 Exploit Status
Exploitation requires valid TeamViewer authentication credentials, which could be obtained through credential theft, phishing, or brute force attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 15.74.5 and later
Vendor Advisory: https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1003/
Restart Required: Yes
Instructions:
1. Open TeamViewer application. 2. Go to Help > Check for new version. 3. Follow prompts to update to version 15.74.5 or later. 4. Restart TeamViewer service/application.
🔧 Temporary Workarounds
Disable 'Allow after confirmation'
allChange TeamViewer security settings to require different authentication methods instead of 'Allow after confirmation'.
TeamViewer GUI: Extras > Options > Security > Advanced Settings > Change 'Access Control' to 'Full Access' or 'Deny' instead of 'Allow after confirmation'
Implement IP whitelisting
allRestrict TeamViewer connections to trusted IP addresses only.
TeamViewer GUI: Extras > Options > Security > Configure > Add trusted IPs to whitelist
🧯 If You Can't Patch
- Disable TeamViewer service entirely until patching is possible
- Implement network-level blocking of TeamViewer traffic using firewall rules
🔍 How to Verify
Check if Vulnerable:
Check TeamViewer version in Help > About. If version is below 15.74.5 and 'Allow after confirmation' is enabled, system is vulnerable.Check Version:
TeamViewer GUI: Help > About (shows version number)Verify Fix Applied:
Confirm version is 15.74.5 or higher in Help > About. Test remote connection with 'Allow after confirmation' to ensure proper confirmation appears.📡 Detection & Monitoring
Log Indicators:
- TeamViewer logs showing successful connections without corresponding 'confirmation' events
- Multiple failed authentication attempts followed by successful connection
Network Indicators:
- TeamViewer traffic (typically port 5938) from unexpected IP addresses
- Unusual data transfer volumes during TeamViewer sessions
SIEM Query:
source="TeamViewer*" AND (event="connection_success" NOT event="confirmation_prompt")