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 in the Storage Management Endpoint, particularly related to processing the /storage/ file path. This flaw allows remote attackers to bypass authorization mechanisms and potentially perform unauthorized operations on the storage component. 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 advanced skills or specific conditions. The CVSS 4.0 base score is 6.3 (medium severity), reflecting limited but meaningful impact on confidentiality, integrity, and availability. The vendor was contacted early but has not issued any response or patch, and no official fixes are currently available. While no known exploits are active in the wild, a public exploit exists, which could be leveraged by attackers. The vulnerability affects the core blog storage management, potentially allowing unauthorized data access, modification, or deletion, which could compromise the integrity and availability of blog content and user data. Given the lack of vendor response, organizations must rely on detection, access controls, and network segmentation to mitigate risk.

For European organizations using Mogu Blog v2, this vulnerability poses a risk to the confidentiality, integrity, and availability of blog content and associated data. Unauthorized access to the storage management endpoint could lead to data leakage, content tampering, or denial of service conditions. This could damage organizational reputation, especially for entities relying on these blogs for communication or customer engagement. The medium severity and high complexity suggest that while widespread exploitation is less likely, targeted attacks against high-value targets remain a concern. The absence of vendor patches increases exposure duration, necessitating proactive defensive measures. Organizations in sectors such as media, education, and public administration that use Mogu Blog may face increased risk. Additionally, compliance with European data protection regulations (e.g., GDPR) could be impacted if personal data is compromised.

Given the lack of official patches, European organizations should implement compensating controls including: 1) Restrict network access to the /storage/ endpoint using firewalls or web application firewalls (WAFs) to limit exposure to trusted IPs only. 2) Monitor logs for unusual access patterns or unauthorized attempts targeting the storage management component. 3) Employ strict access control policies and ensure that default or weak credentials are not used. 4) Consider isolating Mogu Blog instances in segmented network zones to reduce lateral movement risk. 5) Regularly back up blog data to enable recovery in case of tampering or deletion. 6) Engage in threat hunting for indicators of compromise related to this vulnerability. 7) Stay alert for vendor updates or community patches and plan timely application once available. 8) If feasible, evaluate alternative blogging platforms with active security support to reduce long-term risk.