CVE-2026-85345 in FV Flowplayer Video Player Plugin
Summary
by MITRE • 10/14/2026
The FV Flowplayer Video Player WordPress plugin before 7.5.55.7212 does not properly validate a user-supplied URL before performing a server-side fetch, and an existing host-based restriction fails to cover all cases, allowing users with Contributor-level access and above to perform Server-Side Request Forgery (SSRF) attacks. The impact is limited to a semi-blind oracle: the server's fetch reveals whether an internal resource responds and its HTTP status, but the resource's contents are not returned to the attacker.
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Analysis
by VulDB Data Team • 10/14/2026
The FV Flowplayer Video Player WordPress plugin version 7.5.55.7212 contains a critical Server-Side Request Forgery vulnerability stemming from insufficient validation of user-supplied URLs during server-side fetch operations. This flaw allows authenticated attackers with Contributor-level access or higher to manipulate the destination address that the vulnerable application component requests on behalf of the victim server. The core technical deficiency lies in the plugin's failure to strictly enforce allowlists for internal network ranges, relying instead on a host-based restriction mechanism that is incomplete and easily bypassed through various encoding techniques or protocol variations. This misconfiguration aligns with CWE-918, which describes Server-Side Request Forgery where web applications fetch remote resources without validating the user-supplied URL properly.
The operational impact of this vulnerability centers on its utility as a semi-blind oracle rather than a direct data exfiltration vector. Because the server's fetch operation reveals whether an internal resource responds and returns HTTP status codes, attackers can use these responses to map out internal network topologies and identify live hosts behind firewalls or NAT devices that would otherwise be inaccessible from the public internet. This capability enables reconnaissance activities such as port scanning of internal services by observing differences in response times or error messages associated with closed versus open ports. While the attacker cannot directly read the content returned by these internal requests, the ability to determine service availability and version information significantly aids in further exploitation phases against other vulnerable systems within the same network segment.
This vulnerability is categorized under MITRE ATT&CK technique T1598.002, which involves Phishing for Information from Internal Resources via SSRF. The attacker leverages their authenticated WordPress role to trigger server-side requests that probe internal infrastructure, effectively turning the web application into a proxy for network discovery. This behavior facilitates lateral movement within an organization's IT environment by identifying critical assets such as database servers, administrative interfaces, or IoT devices that may have weaker security postures than the public-facing web server. The semi-blind nature of the oracle means that while data theft is not immediate, the intelligence gathered can be combined with other vulnerabilities to achieve full compromise of internal systems.
Mitigation strategies should prioritize upgrading the FV Flowplayer Video Player plugin to version 7.5.55.7212 or later where these validation checks have been strengthened. In cases where immediate patching is not feasible, administrators should implement strict input validation at the web server level using Web Application Firewalls that block requests containing internal IP ranges in URL parameters. Additionally, restricting file upload and media processing functionalities to only those users with Administrator-level privileges can reduce the attack surface by limiting access for lower-privileged accounts like Contributors who currently possess the ability to trigger these vulnerable fetch operations. Network segmentation policies should also be reviewed to ensure that even if an SSRF is exploited, lateral movement between critical internal segments remains restricted through robust firewall rules and zero-trust architecture principles.