ManageEngine AD360 SSO Token Prediction Flaw – CVE-2026-11374: Critical Account Takeover Vulnerability Exposes Enterprise Identity Infrastructure + Video

Introduction:

A critical security vulnerability identified as CVE-2026-11374 has been disclosed in ManageEngine’s AD360 identity and access management suite, affecting multiple integrated products including ADSelfService Plus, RecoveryManager Plus, M365 Manager Plus, and ADAudit Plus. The flaw stems from weaknesses in SSO ticket generation, allowing unauthenticated attackers to predict valid session tokens and potentially take over user accounts. With a CVSS score of 9.0 and classification as “critical,” this vulnerability poses significant risks to enterprises relying on AD360 as a central identity hub.

Learning Objectives:

Understand the technical root cause of CVE-2026-11374 and its impact on SSO token generation
Learn how to identify vulnerable AD360 installations and detect signs of compromise
Master the step-by-step patching and mitigation procedures across affected products
Implement proactive monitoring and hardening strategies to prevent exploitation

You Should Know:

1. Understanding the SSO Token Prediction Vulnerability

The vulnerability exists in how ManageEngine AD360 generates SSO tickets when users authenticate through single sign-on to integrated products. When a user logs in via AD360’s SSO, the system issues a token to validate the session. Security researcher 0xmanhnv discovered through the Zoho BugBounty program that these tokens could be predicted by an unauthenticated attacker.

The technical weakness lies in the token generation algorithm’s insufficient entropy or predictable seed values. An attacker who successfully predicts a valid SSO ticket can obtain the targeted user’s identity and role information, ultimately leading to complete account takeover. In environments where AD360 acts as a central identity hub, this risk becomes more severe as multiple integrated services could be exposed through a single successful attack.

Affected Versions and Patch Status:

|||||

2. Identifying Vulnerable AD360 Installations

Before applying patches, security teams must identify which AD360 installations are affected. The vulnerability affects all AD360 builds below version 4228. To check your installation:

Step-by-Step Assessment:

1. Check AD360 Build Version:

Log in to AD360 as an administrator
Navigate to Help → About to view the current build number
If the build is below 4228, the installation is vulnerable

2. Audit AD360 Integration Settings:

Navigate to Admin → Administration → AD360 Integration
If you had not configured any ManageEngine products (ADManager Plus, ADAudit Plus, ADSelfService Plus, Exchange Reporter Plus, O365 Manager Plus, and RecoveryManager Plus), check if they have been added without authorization
If you had already integrated products, verify that configuration settings remain unchanged

3. Review Critical System Settings:

Check Logon Settings (Admin → Administration) including SSO and TFA configurations
Verify Mail Server settings (Admin → General Settings → Server Settings) for unauthorized modifications

4. Log Analysis Commands (Linux):

 Check AD360 application logs for suspicious integration attempts
grep -i "UpdateProductDetails" /opt/ManageEngine/AD360/logs/.log
grep -i "HSKeyAuthenticator" /opt/ManageEngine/AD360/logs/.log

Review authentication logs for unusual SSO activity
grep -i "SSO" /opt/ManageEngine/AD360/logs/.log | grep -i "failed|error"

Check for unauthorized access patterns in the last 24 hours
find /opt/ManageEngine/AD360/logs -1ame ".log" -mtime -1 -exec grep -l "unauthorized|bypass" {} \;

Windows Command Equivalents:

 Search AD360 logs for suspicious patterns
Select-String -Path "C:\ManageEngine\AD360\logs.log" -Pattern "UpdateProductDetails|HSKeyAuthenticator"

Check for recent unauthorized integration attempts
Get-ChildItem -Path "C:\ManageEngine\AD360\logs.log" | Where-Object {$_.LastWriteTime -gt (Get-Date).AddDays(-1)} | Select-String -Pattern "SSO.failed|authentication.error"

3. Compromise Detection and Incident Response

If you suspect or confirm that your AD360 installation has been compromised, follow this incident response procedure:

Immediate Response Steps:

1. Shut Down the Product Immediately:

 Linux
sudo systemctl stop ad360
 or
/opt/ManageEngine/AD360/bin/shutdown.sh

Windows
net stop "ManageEngine AD360"

2. Restore from a Known Good Backup:

Restore the AD360 installation directory and database from a backup taken before the compromise was discovered
Ensure the backup is verified and free from backdoors

3. Apply the Latest Patch:

Update the product to build 4228 using the official service pack
Download from: https://www.manageengine.com/uk/active-directory-360/service-pack.html

4. Restart and Verify:

 Linux
/opt/ManageEngine/AD360/bin/startup.sh

Windows
net start "ManageEngine AD360"

5. Conduct a Forensic Investigation:

Review all logs for unauthorized access
Check for created backdoor accounts
Audit all integrated product configurations
Reset all administrative credentials

4. Mitigation Without Immediate Patching

If you cannot apply the patch immediately, implement these temporary mitigations:

Manual web.xml Modification (Emergency Workaround):

1. Stop AD360 services

2. Navigate to the web.xml file location: `

\webapps\ads\WEB-INF\web.xml`</h2>

<ol>
<li>Comment out or remove the following servlet mappings:</li>
</ol>

[bash]
<!-- 
<servlet-mapping>
<servlet-1ame>UpdateProductDetails</servlet-1ame>
<url-pattern>/servlet/UpdateProductDetails</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-1ame>HSKeyAuthenticator</servlet-1ame>
<url-pattern>/servlet/HSKeyAuthenticator</url-pattern>
</servlet-mapping>
<servlet>
<servlet-1ame>HSKeyAuthenticator</servlet-1ame>
<servlet-class>com.manageengine.ads.fw.servlet.HSKeyAuthenticator</servlet-class>
</servlet>
<servlet>
<servlet-1ame>UpdateProductDetails</servlet-1ame>
<servlet-class>com.manageengine.ads.fw.servlet.UpdateProductDetails</servlet-class>
</servlet>
-->

4. Restart AD360 services

Important Note: Commenting these servlets will disable data synchronization and data flow with integrated products. This is a temporary measure only; apply the official patch as soon as possible.

5. Network-Level Hardening

Implement additional security controls to protect AD360 installations:

Firewall Rules (Linux iptables):

 Restrict access to AD360 administrative interface (default port 8080)
iptables -A INPUT -p tcp --dport 8080 -s 192.168.0.0/16 -j ACCEPT  Allow only internal subnet
iptables -A INPUT -p tcp --dport 8080 -j DROP  Deny all other access

Block public exposure of AD360
iptables -A INPUT -p tcp --dport 8080 -i eth0 -j DROP  If eth0 is public interface

Windows Firewall (PowerShell):

 Remove public access rule for AD360 port
Remove-1etFirewallRule -DisplayName "AD360 Public Access"

Create restricted access rule for internal subnet only
New-1etFirewallRule -DisplayName "AD360 Internal Only" -Direction Inbound -Protocol TCP -LocalPort 8080 -RemoteAddress "192.168.0.0/16" -Action Allow

Network Segmentation:

Place AD360 servers in a dedicated management subnet
Restrict access to AD360 administrative interfaces to authorized administrators only
Use VPN or jump hosts for remote administrative access
Implement network access control lists (ACLs) to prevent unauthorized network access

6. Monitoring and Detection Strategy

Establish continuous monitoring to detect exploitation attempts:

SIEM Monitoring Queries:

 Monitor for unusual SSO ticket generation patterns
 Look for multiple SSO requests from same IP in short time window
grep "SSO" /opt/ManageEngine/AD360/logs/.log | awk '{print $1, $2, $NF}' | sort | uniq -c | sort -1r | head -20

Detect potential token prediction attempts (failed authentications)
grep -i "authentication failed" /opt/ManageEngine/AD360/logs/.log | wc -l

Monitor for unauthorized integration attempts
grep -i "UpdateProductDetails|HSKeyAuthenticator" /opt/ManageEngine/AD360/logs/.log

Windows Event Log Monitoring:

 Query Windows Security Log for failed logon attempts to AD360
Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4625} | Where-Object {$_.Message -match "AD360"}

Monitor for service changes
Get-WinEvent -FilterHashtable @{LogName='System'; ID=7036} | Where-Object {$_.Message -match "AD360"}

Recommended Monitoring Rules:

Alert on any unauthenticated access attempts to AD360 integration endpoints
Monitor for abnormal SSO activity patterns (multiple tokens from single IP)
Track administrative account activities and privilege changes
Set up alerts for configuration changes to AD360 integration settings

7. Post-Patch Validation and Testing

After applying patches, verify the fix is effective:

Validation Steps:

1. Verify Patch Installation:

 Check build version after patching
curl -s http://localhost:8080/ads/version | grep "build"
 Expected output should show build 4228 or higher

2. Test SSO Functionality:

Perform test SSO authentications to ensure token generation works
Verify that integrated products can still authenticate properly
Check that all integrated applications remain functional

3. Penetration Testing (Ethical):

Attempt to predict SSO tokens using known patterns (should fail)
Test the vulnerable endpoints for unauthorized access (should be blocked)
Verify that the HSKeyAuthenticator and UpdateProductDetails servlets are secured

4. Log Verification:

 Check logs for successful patch application
grep -i "patch|update|build 4228" /opt/ManageEngine/AD360/logs/.log

What Undercode Say:

Predictable Token Generation is a Fundamental Cryptographic Failure: The vulnerability demonstrates that SSO implementations must use cryptographically secure random number generators with sufficient entropy. Organizations should require third-party security reviews of all authentication mechanisms.
Centralized Identity Hubs Are High-Value Targets: AD360’s role as a central identity hub multiplies the impact of this vulnerability. A single successful exploit could compromise multiple integrated systems simultaneously, enabling rapid lateral movement across the enterprise.

Analysis:

The CVE-2026-11374 vulnerability highlights the critical importance of secure SSO token generation in modern identity management systems. The fact that an unauthenticated attacker could predict valid SSO tickets represents a fundamental failure in cryptographic implementation. Organizations using ManageEngine products in AD360 environments should prioritize patching given the CVSS 9.0 critical severity rating. The vulnerability’s discovery through a bug bounty program underscores the value of responsible disclosure and external security research. Enterprises should review their identity management architectures to ensure SSO implementations follow best practices for token generation, including sufficient entropy, proper seeding, and regular security audits. The rapid patch release timeline (June 3-12, 2026) demonstrates ManageEngine’s commitment to addressing security issues, but organizations must remain vigilant as attackers may attempt to exploit unpatched systems.

Prediction:

-1 Organizations that delay patching will likely face increased scanning and exploitation attempts as proof-of-concept code becomes publicly available, potentially leading to account takeovers and data breaches within weeks.
-1 The vulnerability’s predictable token generation pattern suggests similar weaknesses may exist in other SSO implementations, potentially triggering a wave of security audits and disclosures across the identity management industry.
+1 This incident will accelerate adoption of zero-trust architecture principles and push vendors to implement more robust cryptographic standards for session token generation, ultimately strengthening enterprise identity security.
-1 Healthcare and financial services organizations using AD360 face elevated risk given the sector’s high-value data and the vulnerability’s potential for privilege escalation.
+1 The bug bounty program’s success in identifying this critical flaw will encourage more organizations to invest in similar programs, improving overall software security posture.
-1 Attackers may leverage this vulnerability in conjunction with other exploits to achieve full domain compromise, particularly in environments where AD360 has privileged access to Active Directory.
+1 This event will drive increased focus on SSO security testing and token generation validation in DevSecOps pipelines, reducing similar vulnerabilities in future product releases.

▶️ Related Video (76% Match):

🎯Let’s Practice For Free:

🎓 Live Courses & Certifications:

Join Undercode Academy for Verified Certifications

🚀 Request a Custom Project:

Secure, high-velocity infrastructure and disruptive technological engineering. Contact our engineering team for high-tier development and proprietary systems:
[email protected]
💎 Smart Architecture | 🛡️ Secure by Design | ⭐ Trusted by Thousands

IT/Security Reporter URL:

Reported By: Dlross Manageengine – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

🔐JOIN OUR CYBER WORLD [ CVE News • HackMonitor • UndercodeNews ]

💬 Whatsapp | 💬 Telegram

📢 Follow UndercodeTesting & Stay Tuned:

𝕏 formerly Twitter 🐦 | @ Threads | 🔗 Linkedin | 🦋BlueSky

Listen to this Post