CVE-2025-13814 is a server-side request forgery vulnerability identified in the moxi159753 Mogu Blog v2 software, specifically affecting versions 5.0, 5.1, and 5.2. The vulnerability resides in the LocalFileServiceImpl.uploadPictureByUrl function within the /file/uploadPicsByUrl endpoint. This function allows users to upload pictures by specifying a URL, but due to insufficient validation or sanitization of the input URL, an attacker can manipulate the server to send crafted HTTP requests to arbitrary internal or external resources. This SSRF flaw can be exploited remotely without requiring authentication or user interaction, increasing the attack surface. The impact includes potential unauthorized access to internal services, information disclosure, or indirect attacks on other systems within the network. The vendor was notified early but has not responded or provided patches, and while the exploit code has been publicly released, no confirmed exploitation in the wild has been reported. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P) reflects a medium severity with network attack vector, low attack complexity, no privileges or user interaction needed, and limited impacts on confidentiality, integrity, and availability. The lack of segmentation or filtering in the vulnerable function makes it a significant risk for organizations using this blogging platform, especially if exposed to the internet.

For European organizations running Mogu Blog v2 up to version 5.2, this SSRF vulnerability poses a moderate risk. Exploitation could allow attackers to access internal network resources that are otherwise inaccessible externally, potentially leading to information disclosure or pivoting attacks. Confidentiality could be compromised if sensitive internal endpoints are queried. Integrity and availability impacts are limited but possible if the SSRF is chained with other vulnerabilities or used to trigger denial-of-service conditions on internal services. Since no authentication is required, any exposed instance of the vulnerable software is at risk. The lack of vendor response and patches increases exposure time. Organizations in sectors with sensitive internal networks or regulatory requirements (e.g., finance, healthcare, government) may face compliance and reputational risks if exploited. The medium severity rating suggests prioritizing mitigation but not immediate emergency response unless evidence of active exploitation emerges.

1. Immediately audit all instances of Mogu Blog v2 within the organization to identify affected versions (5.0, 5.1, 5.2). 2. Restrict network egress from the web server hosting Mogu Blog to only necessary external endpoints, implementing strict firewall rules to prevent arbitrary outbound requests. 3. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious requests targeting the /file/uploadPicsByUrl endpoint or containing unusual URL parameters. 4. If possible, disable or restrict the uploadPictureByUrl functionality until a vendor patch or official fix is available. 5. Monitor logs for unusual outbound HTTP requests originating from the blogging server, especially to internal IP ranges or unexpected external domains. 6. Segment the blogging platform server from critical internal networks to limit potential lateral movement. 7. Engage in threat intelligence sharing to stay updated on any emerging exploits or patches. 8. Consider implementing input validation proxies or reverse proxies that sanitize or block malicious URL inputs. 9. Prepare incident response plans specific to SSRF exploitation scenarios. 10. Advocate for vendor engagement or consider alternative blogging platforms if remediation is delayed.