{"id":56434,"date":"2025-07-01T12:51:45","date_gmt":"2025-07-01T12:51:45","guid":{"rendered":""},"modified":"2025-10-21T17:37:27","modified_gmt":"2025-10-21T23:37:27","slug":"cve-2025-49151-unauthenticated-attackers-can-forge-json-web-tokens-in-microsens-nmp-web","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-49151-unauthenticated-attackers-can-forge-json-web-tokens-in-microsens-nmp-web\/","title":{"rendered":"CVE-2025-49151: Unauthenticated Attackers Can Forge JSON Web Tokens in MICROSENS NMP Web+<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

CVE-2025-49151 is a severe vulnerability found in MICROSENS NMP Web+, which allows unauthenticated attackers to forge JSON Web Tokens (JWT) and thereby bypass the authentication process. This vulnerability poses a significant risk to any organization utilizing MICROSENS NMP Web+, as it can lead to system compromise or data leakage. In this era of ever-evolving cyber threats, understanding such vulnerabilities and implementing effective mitigation measures is crucial to maintaining robust cybersecurity<\/a>.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-49151
\nSeverity: Critical, with a CVSS score of 9.1
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

MICROSENS NMP<\/a> Web+ | All versions prior to the patch<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability lies in the handling of JSON Web<\/a> Tokens within the MICROSENS NMP Web+ system. Attackers can exploit<\/a> this flaw by creating forged JWTs, which the system will accept as genuine. Given that JWTs are used to authenticate users, this allows attackers to bypass authentication<\/a> measures without needing valid credentials. This can lead to unauthorized access<\/a> to the system, potentially leading to system compromise or data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here’s a conceptual example of how an attacker might exploit this vulnerability:<\/p>\n

POST \/vulnerable\/endpoint HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{\n\"alg\": \"none\",\n\"typ\": \"JWT\"\n}\n{\n\"sub\": \"1234567890\",\n\"name\": \"John Doe\",\n\"admin\": true\n}<\/code><\/pre>\n
In this example, the attacker creates a JWT with no algorithm (“alg”: “none”), effectively bypassing the signature verification process and tricking the system<\/a> into thinking it’s a legitimate token.<\/p>\n
Mitigation Measures<\/strong><\/p>\n
The primary mitigation measure for CVE-2025-49151 is to apply the vendor’s patch. All organizations using MICROSENS NMP Web+ should apply this patch as soon as possible to protect their systems from potential<\/a> attacks.
\nIn situations where the patch cannot be immediately applied, temporary mitigation can be achieved using a Web Application Firewall (WAF) or Intrusion Detection System (IDS). These systems can detect and block malicious activity, providing a layer of security against potential exploits<\/a>.
\nRemember, vulnerabilities like CVE-2025-49151 highlight the importance<\/a> of a proactive approach to cybersecurity. Regularly monitoring for new vulnerabilities and promptly applying updates<\/a> and patches is crucial for protecting your systems against cyber threats.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-49151 is a severe vulnerability found in MICROSENS NMP Web+, which allows unauthenticated attackers to forge JSON Web Tokens (JWT) and thereby bypass the authentication process. This vulnerability poses a significant risk to any organization utilizing MICROSENS NMP Web+, as it can lead to system compromise or data leakage. In this era of ever-evolving […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[75],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-56434","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-authentication-bypass"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t