CVE-2025-55853 is a critical SSRF vulnerability affecting SoftVision webPDF versions prior to 10.0.2. The root cause is the PDF converter's failure to validate or restrict the protocols used in resources referenced by uploaded files. Specifically, the application allows protocols such as http:// and file:/// within uploaded XML or HTML files. When these files are processed and rendered into PDFs, the server performs requests to these specified resources without proper validation. This behavior enables attackers to conduct internal port scanning by triggering requests to internal IP addresses and ports, potentially mapping internal network topology. Additionally, the vulnerability allows Local File Inclusion (LFI), where attackers can cause the server to read and include local files in the rendered PDF output, risking exposure of sensitive files. The vulnerability does not require any authentication or user interaction, making it remotely exploitable by unauthenticated attackers. The CVSS v3.1 base score is 9.1 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N), reflecting high confidentiality and integrity impact with network attack vector and low attack complexity. No patches or exploit code are currently publicly available, but the risk is significant given the potential for internal reconnaissance and data leakage. The vulnerability is classified under CWE-918 (Server-Side Request Forgery).

The impact of CVE-2025-55853 is substantial for organizations using vulnerable versions of SoftVision webPDF. Successful exploitation can lead to unauthorized internal network reconnaissance, allowing attackers to map internal services and ports that are otherwise inaccessible externally. This can facilitate further attacks such as lateral movement, exploitation of internal services, or data exfiltration. The Local File Inclusion aspect can expose sensitive configuration files, credentials, or other critical data stored on the server, severely compromising confidentiality and integrity. Although availability is not directly affected, the breach of internal network information and sensitive files can lead to significant operational and reputational damage. Organizations in sectors with sensitive data or critical infrastructure are particularly at risk, as attackers can leverage this vulnerability to gain footholds or escalate privileges within internal networks.

To mitigate CVE-2025-55853, organizations should immediately upgrade SoftVision webPDF to version 10.0.2 or later, where the vulnerability is addressed. If upgrading is not immediately possible, implement strict input validation and filtering on uploaded files to disallow or sanitize protocols such as file:/// and http:// in resource references. Employ network segmentation and firewall rules to restrict the webPDF server's ability to make arbitrary outbound requests, especially to internal IP ranges. Monitor and log PDF conversion activities for unusual or suspicious resource requests. Additionally, consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block SSRF attack patterns targeting the PDF converter. Regularly audit and review server file permissions to minimize the impact of potential LFI exploitation. Finally, maintain an incident response plan to quickly address any signs of exploitation.