CVE-2025-58840 is a vulnerability classified as CWE-79, indicating an Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting (XSS). This specific vulnerability affects the Ibnul H. Custom Team Manager software, versions up to and including 2.4.2. The vulnerability is of the Stored XSS type, meaning that malicious input submitted by an attacker is stored persistently on the server (e.g., in a database) and later rendered in web pages viewed by other users without proper sanitization or encoding. This allows attackers to inject malicious scripts that execute in the browsers of users who access the affected pages. The CVSS v3.1 base score is 6.5, which corresponds to a medium severity rating. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) indicates that the attack can be performed remotely over the network with low attack complexity, requires privileges (PR:L) on the application but only limited user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality, integrity, and availability is low to moderate, as the attacker can potentially steal session tokens, manipulate displayed content, or perform actions on behalf of users, but the overall damage is limited by the required privileges and user interaction. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was published on September 5, 2025, and assigned by Patchstack. Stored XSS vulnerabilities are significant because they can lead to account compromise, data theft, and further exploitation such as pivoting to other systems or social engineering attacks.

For European organizations using Ibnul H. Custom Team Manager, this vulnerability poses a tangible risk to the confidentiality and integrity of user data and the availability of the service. Attackers exploiting this vulnerability could execute malicious scripts in the browsers of legitimate users, potentially stealing session cookies, credentials, or performing unauthorized actions within the application context. This can lead to unauthorized access to sensitive team management data, disruption of workflows, and reputational damage. Given that the vulnerability requires some level of privilege and user interaction, the risk is somewhat mitigated but remains significant in environments where multiple users have access to the application and may be targeted via phishing or social engineering. The scope change indicates that the impact could extend beyond the immediate application, possibly affecting integrated systems or services. European organizations in sectors such as finance, healthcare, and government, where team management tools are critical and data sensitivity is high, could face compliance issues under GDPR if personal data is exposed or manipulated. Additionally, the persistence of the stored XSS increases the risk of widespread impact within an organization if not promptly addressed.

1. Immediate mitigation should include implementing strict input validation and output encoding on all user-supplied data rendered in web pages, especially in team management interfaces. 2. Apply Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 3. Limit privileges of users within the Custom Team Manager to the minimum necessary to reduce the risk of exploitation. 4. Educate users about the risks of clicking on suspicious links or interacting with untrusted content within the application. 5. Monitor application logs and user activity for unusual behavior that may indicate exploitation attempts. 6. Since no patch is currently linked, organizations should contact the vendor Ibnul H. for updates or consider temporary workarounds such as disabling vulnerable features or restricting access to the application until a fix is available. 7. Conduct regular security assessments and penetration testing focused on XSS vulnerabilities to detect and remediate similar issues proactively.