CVE-2025-8740 is a cross-site scripting (XSS) vulnerability identified in the zhenfeng13 My-Blog software, specifically affecting version 1.0.0 and earlier. The vulnerability resides in the /admin/categories/save endpoint within the Category Handler component. It arises from improper sanitization or validation of the 'categoryName' parameter, which can be manipulated by an attacker to inject malicious scripts. This vulnerability is exploitable remotely without authentication, although it requires some level of privileges (PR:H) and user interaction (UI:P) according to the CVSS vector. The attack vector is network-based (AV:N), and the attack complexity is low (AC:L). The impact primarily affects the integrity of the web application by enabling script injection, which can lead to session hijacking, defacement, or redirection to malicious sites. The CVSS score of 4.8 classifies it as a medium severity issue. No patches have been officially released yet, and while no known exploits are currently active in the wild, the exploit details have been publicly disclosed, increasing the risk of exploitation. The vulnerability does not affect confidentiality or availability significantly but poses a moderate risk to the integrity and trustworthiness of the affected web application. Given the nature of My-Blog as a blogging platform, the vulnerability could be leveraged to target site administrators or users who interact with the affected category management functionality, potentially compromising user sessions or injecting malicious content into the blog environment.

For European organizations using zhenfeng13 My-Blog version 1.0.0 or earlier, this vulnerability could lead to unauthorized script execution within the administrative interface, potentially allowing attackers to hijack admin sessions or manipulate blog content. This could damage the organization's reputation, lead to data integrity issues, and expose users to phishing or malware delivery. Although the vulnerability requires some privilege level and user interaction, the public disclosure of exploit details increases the likelihood of targeted attacks, especially against smaller organizations or niche websites that may not have robust security practices. The impact is particularly relevant for organizations relying on My-Blog for public-facing content management, as compromised administrative functions could facilitate broader attacks or defacements. However, the medium severity and lack of known active exploits suggest the threat is moderate but should not be ignored.

1. Immediate mitigation should include restricting access to the /admin/categories/save endpoint to trusted administrators only, ideally through IP whitelisting or VPN access. 2. Implement strict input validation and output encoding on the 'categoryName' parameter to neutralize any injected scripts. 3. Apply Content Security Policy (CSP) headers to limit the execution of unauthorized scripts within the blog environment. 4. Monitor administrative logs for unusual activity related to category management. 5. If possible, upgrade to a patched version once available or consider migrating to alternative blogging platforms with active security maintenance. 6. Educate administrators about the risks of phishing and social engineering that could facilitate user interaction required for exploitation. 7. Employ web application firewalls (WAFs) with rules to detect and block XSS payloads targeting the vulnerable endpoint. 8. Conduct regular security assessments and penetration tests focusing on administrative interfaces.