CVE-2025-49152 is a high-severity vulnerability affecting Microsens NMP Web+, a network management platform. The core issue is the use of JSON Web Tokens (JWTs) that do not expire, constituting an instance of CWE-613: Insufficient Session Expiration. JWTs are commonly used for stateless authentication, where a token encodes user identity and authorization claims. Proper security practice mandates that these tokens have a limited lifetime to reduce the risk of unauthorized access if tokens are leaked or stolen. In this case, the affected Microsens NMP Web+ versions issue JWTs without any expiration mechanism, meaning once a token is issued, it remains valid indefinitely unless explicitly revoked. This flaw allows an attacker who obtains a valid JWT—via interception, theft, or other means—to maintain persistent access to the system without re-authentication. The CVSS 3.1 base score of 8.7 reflects the vulnerability's characteristics: it is remotely exploitable over the network without authentication or user interaction, has low attack complexity, and can lead to high impact on confidentiality and integrity by granting unauthorized access. The vulnerability does not affect availability or require privileges, making it particularly dangerous in environments where the NMP Web+ platform manages critical network infrastructure. No known exploits are currently reported in the wild, but the simplicity of exploitation and severity suggest it is a prime target for attackers once discovered. No patches or mitigations have been officially released yet, increasing the urgency for organizations to implement compensating controls.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on Microsens NMP Web+ for network management and monitoring. Unauthorized persistent access could allow attackers to manipulate network configurations, intercept or redirect traffic, and compromise the integrity and confidentiality of sensitive data. This could lead to operational disruptions, data breaches, and potential regulatory non-compliance under GDPR due to unauthorized access to personal or sensitive information. Critical infrastructure operators, telecommunications providers, and enterprises with complex network environments are particularly at risk. The lack of token expiration increases the window of opportunity for attackers, making incident detection and response more difficult. Additionally, the vulnerability could be leveraged as a foothold for lateral movement within networks, escalating the overall risk posture of affected organizations.

Given the absence of an official patch, European organizations should immediately implement the following mitigations: 1) Enforce strict network segmentation and access controls around systems running Microsens NMP Web+ to limit exposure. 2) Monitor network traffic for anomalous JWT usage or repeated authentication tokens to detect potential misuse. 3) Implement short-lived session timeouts at the application or proxy level where possible, forcing re-authentication. 4) Use Web Application Firewalls (WAFs) to detect and block suspicious token usage patterns. 5) Rotate any existing JWTs and credentials associated with the platform to invalidate potentially compromised tokens. 6) Employ multi-factor authentication (MFA) on all administrative access points to reduce risk from token theft. 7) Maintain rigorous logging and alerting on authentication events to enable rapid incident response. 8) Engage with Microsens for updates and patches and plan for immediate deployment once available. These steps go beyond generic advice by focusing on compensating controls tailored to the JWT token misuse scenario.