CVE-2025-11699 Overview
CVE-2025-11699 is a high-severity session hijacking vulnerability affecting nopCommerce, a popular open-source e-commerce platform built on ASP.NET Core. The vulnerability exists because nopCommerce v4.70 and prior, as well as version 4.80.3, does not properly invalidate session cookies after logout or session termination. This flaw allows an attacker who has obtained a valid session cookie to maintain access to privileged endpoints, including the /admin panel, even after the legitimate user has logged out.
This vulnerability is classified under CWE-613 (Insufficient Session Expiration), which occurs when a web application permits an attacker to reuse old session credentials or session IDs for authorization. The network-accessible attack vector combined with the potential for unauthorized access to administrative functions makes this a significant security concern for any organization running affected versions.
Critical Impact
Attackers with access to valid session cookies can hijack user sessions and access privileged administrative endpoints even after users have logged out, potentially leading to unauthorized data access, configuration changes, and full platform compromise.
Affected Products
- nopCommerce v4.70 and all prior versions
- nopCommerce v4.80.3
- Any nopCommerce installation using affected session management
Discovery Timeline
- 2025-12-01 - CVE-2025-11699 published to NVD
- 2025-12-02 - Last updated in NVD database
Technical Details for CVE-2025-11699
Vulnerability Analysis
The vulnerability carries a CVSS v3.1 score of 7.1 (High) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N. Breaking down this vector:
- Attack Vector (AV:N): Network-accessible, meaning the attack can be conducted remotely
- Attack Complexity (AC:L): Low complexity required to exploit
- Privileges Required (PR:N): No prior authentication needed by the attacker
- User Interaction (UI:R): Some user interaction is required (user must log in and generate a session)
- Confidentiality Impact (C:L): Low confidentiality impact
- Integrity Impact (I:H): High integrity impact due to potential unauthorized modifications
- Availability Impact (A:N): No direct availability impact
The EPSS (Exploit Prediction Scoring System) data indicates a probability of 0.03% with a percentile ranking of 8.151, suggesting relatively low current exploitation activity in the wild.
Root Cause
The root cause of CVE-2025-11699 lies in improper session lifecycle management within nopCommerce's authentication system. When a user initiates a logout action, the application fails to properly invalidate the server-side session state associated with the user's authentication cookie. As a result, the session cookie remains valid and can be reused for subsequent requests to protected resources.
Proper session management should ensure that upon logout:
- The server-side session data is destroyed
- Session tokens are revoked and added to a deny list
- Any cached authentication state is cleared
- The session cookie is properly expired on the client side
The affected versions of nopCommerce do not adequately implement these session termination procedures, leaving sessions in a state where they can be hijacked and reused.
Attack Vector
An attacker can exploit this vulnerability through several scenarios:
Session Token Theft: If an attacker obtains a valid session cookie through network interception (on unencrypted connections), cross-site scripting (XSS), or physical access to a user's browser, they can use this cookie to impersonate the user.
Shared Computer Attack: On shared computers or public terminals, even after a user logs out of their nopCommerce session, an attacker could recover the session cookie from browser storage or network logs and reuse it.
Persistent Access: Once a session cookie is captured, the attacker can maintain access to the victim's account indefinitely or until the session expires naturally, as the logout action does not invalidate the token.
The attack targets privileged endpoints such as /admin, which provides access to sensitive e-commerce operations including order management, customer data, product configuration, and system settings.
Detection Methods for CVE-2025-11699
Indicators of Compromise
- Multiple active sessions for the same user account from different IP addresses or geographic locations
- Access to administrative endpoints (/admin) after recorded logout events in application logs
- Session cookies being used from unexpected IP addresses or user agents
- Unusual administrative activity patterns occurring outside normal business hours
Detection Strategies
Organizations should implement comprehensive logging and monitoring for session-related events in their nopCommerce deployments:
Log Analysis: Monitor authentication logs for patterns indicating session reuse after logout. Correlate logout timestamps with subsequent API or page requests using the same session identifier.
Session Monitoring: Implement server-side session tracking that monitors for sessions that should have been terminated. Alert on any session activity following a recorded logout event.
Network Traffic Analysis: Monitor for requests to administrative endpoints that do not follow expected authentication flows. Unusual patterns of direct access to /admin paths without preceding login activity may indicate session hijacking.
User Agent Correlation: Track and compare user agents associated with sessions. Changes in user agent for the same session may indicate cookie theft and reuse.
Monitoring Recommendations
Deploy endpoint detection and response (EDR) solutions that can monitor web application activity and correlate session behavior across the application stack. SentinelOne's behavioral AI can detect anomalous access patterns and alert security teams to potential session hijacking attempts.
Implement real-time alerting for:
- Admin panel access from new IP addresses
- Session usage patterns that deviate from established baselines
- Multiple concurrent sessions for privileged accounts
- Geographic impossibilities (logins from distant locations within short timeframes)
How to Mitigate CVE-2025-11699
Immediate Actions Required
- Upgrade nopCommerce to any version above 4.70 that is not 4.80.3 (these versions contain the fix)
- Audit current active sessions and force logout for all administrative users
- Review administrative access logs for any suspicious activity that may indicate prior exploitation
- Implement additional session validation controls at the network layer while planning the upgrade
Patch Information
The nopCommerce development team has addressed this vulnerability in versions released after 4.70, with the exception of 4.80.3 which remains vulnerable. Organizations should consult the official nopCommerce release notes at https://www.nopcommerce.com/en/release-notes for detailed upgrade guidance.
Additional technical details and discussion can be found at:
- GitHub Issue: https://github.com/nopSolutions/nopCommerce/issues/7044
- CERT/CC Advisory: https://www.kb.cert.org/vuls/id/633103
- Full Disclosure: https://seclists.org/fulldisclosure/2025/Aug/14
Workarounds
If immediate patching is not feasible, organizations should implement compensating controls:
Session Timeout Reduction: Reduce session timeout values to minimize the window of opportunity for session hijacking. Configure shorter idle and absolute timeouts.
IP Binding: Where operationally feasible, bind sessions to the originating IP address. This prevents session cookies from being used from different network locations.
Additional Authentication: Implement additional authentication factors for administrative access, particularly for sensitive operations. This adds a layer of protection even if a session is compromised.
Network Segmentation: Restrict access to administrative endpoints to trusted networks only. Use firewall rules or reverse proxy configurations to limit /admin access to specific IP ranges.
Cookie Security Hardening: Ensure all session cookies are configured with Secure, HttpOnly, and SameSite attributes to reduce the risk of cookie theft through XSS or other client-side attacks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
