CVE-2025-12305 is a deserialization vulnerability found in the quequnlong shiyi-blog software, specifically affecting versions 1.2.0 and 1.2.1. The flaw resides in an unspecified function within the Job Handler component, implemented in the SysJobController.java file. Deserialization vulnerabilities occur when untrusted data is deserialized without proper validation, allowing attackers to craft malicious serialized objects that can execute arbitrary code or manipulate application logic. This vulnerability can be exploited remotely without authentication or user interaction, increasing its risk profile. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L, low privileges), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). The exploit has been publicly disclosed, which raises the likelihood of exploitation, although no active exploitation has been confirmed. The vulnerability affects the Job Handler component, which likely manages scheduled tasks or background jobs, potentially allowing attackers to execute arbitrary code or disrupt job scheduling. The absence of patches or official fixes at the time of publication necessitates alternative mitigations. Given the nature of deserialization flaws, attackers could leverage this vulnerability to gain unauthorized access, execute code remotely, or cause denial of service conditions, depending on the payload delivered during exploitation.

For European organizations using quequnlong shiyi-blog versions 1.2.0 or 1.2.1, this vulnerability poses risks including unauthorized remote code execution, data manipulation, and service disruption. The Job Handler component's compromise could allow attackers to interfere with scheduled tasks, potentially leading to persistent footholds or operational interruptions. Confidentiality could be partially compromised if attackers access sensitive data processed by the blog platform. Integrity and availability impacts are also possible but considered low to medium due to the limited scope of the affected component. Organizations relying on shiyi-blog for internal communications, content management, or public-facing blogs may face reputational damage and operational downtime if exploited. The public availability of exploit code increases the risk of opportunistic attacks, especially in environments lacking robust network segmentation or input validation controls. The medium CVSS score reflects these moderate but tangible risks. European entities in sectors with high reliance on web content management or those targeted by threat actors exploiting deserialization vulnerabilities should be particularly vigilant.

1. Immediate identification and inventory of all quequnlong shiyi-blog instances, focusing on versions 1.2.0 and 1.2.1. 2. Apply vendor patches or updates as soon as they become available; if no official patch exists, consider upgrading to a non-vulnerable version or alternative software. 3. Implement strict input validation and deserialization hardening techniques, such as using allowlists for deserialized classes and disabling unsafe deserialization features. 4. Restrict network access to the Job Handler endpoints by applying firewall rules or network segmentation to limit exposure to untrusted networks. 5. Monitor logs and network traffic for suspicious deserialization payloads or anomalous job scheduling activities. 6. Employ runtime application self-protection (RASP) or web application firewalls (WAF) with rules targeting deserialization attack patterns. 7. Conduct security awareness training for developers and administrators on secure coding practices related to deserialization. 8. Regularly back up critical data and ensure incident response plans include scenarios involving deserialization exploits.