CVE-2025-56218
CWE-434Published: October 17, 2025· Updated: Jul 5, 2026
Official Description
An arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers to execute arbitrary code via uploading a crafted PDF file.
Risk Analysis
This critical arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers to execute arbitrary code. By uploading a specially crafted PDF file, an attacker can achieve remote code execution on the system. With a CVSS score of 9.8, this vulnerability presents a severe risk of complete system compromise.
No public exploit is currently known for this vulnerability. It is remotely exploitable without authentication due to its network attack vector and low attack complexity.
To mitigate, update SigningHub to a version that properly validates and sanitizes uploaded files. Implement strict file type and content validation for all uploads.
Technical Analysis
CVE-2025-56218 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (1)
Quick Facts
Related CVEs (CWE-434)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-56218 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts