CVE-2025-13813 is a vulnerability identified in moxi159753 Mogu Blog v2, specifically affecting versions 5.0 through 5.2. The issue arises from missing authorization checks within the Storage Management Endpoint, particularly in the processing of the /storage/ directory or component. This flaw allows remote attackers to bypass authorization mechanisms, potentially enabling unauthorized access to stored files or data manipulation. The vulnerability does not require any authentication or user interaction, increasing its risk profile. However, the attack complexity is rated as high, and exploitability is difficult, indicating that successful exploitation requires significant skill or specific conditions. Despite these challenges, a public exploit exists, which increases the risk of exploitation over time. The vendor was notified early but has not provided any patches or mitigation guidance, leaving users exposed. The CVSS 4.0 base score is 6.3, reflecting a medium severity level, with network attack vector, high attack complexity, no privileges or user interaction needed, and low impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported yet. The vulnerability primarily threatens the confidentiality and integrity of data managed by the Storage Management Endpoint, potentially allowing attackers to access or alter stored content without authorization.

For European organizations, the vulnerability poses a risk to the confidentiality and integrity of data managed by Mogu Blog v2 installations. Unauthorized access to storage components could lead to data leakage, defacement, or unauthorized content uploads, impacting brand reputation and user trust. Organizations running public-facing blogs or content management systems based on Mogu Blog v2 are particularly vulnerable to remote exploitation. The medium severity and high complexity suggest targeted attacks rather than widespread automated exploitation, but the availability of a public exploit increases the risk over time. Data protection regulations such as GDPR heighten the impact of any data breach resulting from this vulnerability, potentially leading to regulatory penalties and legal consequences. Additionally, compromised blog platforms could be leveraged for phishing or malware distribution campaigns, amplifying the threat landscape for European entities.

Since no official patches are available, European organizations should implement compensating controls immediately. These include restricting network access to the /storage/ endpoint using firewalls or web application firewalls (WAFs) to allow only trusted IP addresses or internal networks. Employ strict access control lists (ACLs) and ensure that the storage directories are not publicly accessible unless absolutely necessary. Regularly audit and monitor logs for unusual access patterns or unauthorized attempts targeting the storage endpoint. Consider deploying intrusion detection/prevention systems (IDS/IPS) tuned to detect exploitation attempts against this vulnerability. If feasible, isolate the Mogu Blog server from critical internal networks to limit lateral movement in case of compromise. Organizations should also prepare for rapid patch deployment once the vendor releases a fix and consider alternative blogging platforms if the risk is unacceptable. Finally, conduct user awareness training to recognize potential phishing or social engineering attacks that might exploit compromised blog infrastructure.