CVE-2025-53830 -- CVSS 9.1 Vulnerability Briefing

CVE-2025-53830 | CVSS 9.1 (Critical) | Exploit: No known exploit

What Is It

CVE-2025-53830 is a Server-Side Request Forgery (SSRF) vulnerability in the Anti-Virus for ownCloud application, a security plugin used for scanning files within the ownCloud file storage, synchronization, and sharing platform.

Technical Detail

The flaw exists in versions of Anti-Virus for ownCloud prior to 1.2.3, where the application fails to adequately validate or restrict server-side requests, likely when communicating with an external antivirus scanning service or endpoint. An attacker who can influence the request parameters, potentially through a crafted file upload or API interaction, may be able to coerce the server into making arbitrary outbound HTTP requests to internal or external resources. Successful exploitation could expose internal network services, cloud metadata endpoints, or sensitive infrastructure that would otherwise be inaccessible from outside the network perimeter.

Exploitation Status

No known exploit exists for this vulnerability at this time. It is not listed in the CISA Known Exploited Vulnerabilities catalog. Despite the critical CVSS score of 9.1, there is no public proof-of-concept code or evidence of active exploitation in the wild as of this writing.

Who Is Targeting This

No specific threat actor attribution at this time. Neither confirmed nor reported threat actor activity has been associated with this CVE in available intelligence sources.

What To Do

Upgrade Anti-Virus for ownCloud to version 1.2.3 or later immediately, as this is the vendor-confirmed patched release. Given the critical severity rating and the nature of SSRF vulnerabilities in file-sharing infrastructure, patching should be treated as high priority, particularly for deployments where ownCloud instances are internet-facing or operate within sensitive internal networks. As an interim measure, restrict outbound network access from the ownCloud server to only explicitly required antivirus scanning endpoints using firewall rules or egress filtering. Monitor server-side logs for anomalous outbound HTTP requests originating from the ownCloud application process, especially to internal RFC 1918 address ranges or cloud metadata services such as 169.254.169.254. No CISA binding directive applies at this time.