Overview
The cybersecurity world is no stranger to vulnerabilities, but the recent discovery of CVE-2025-46490 presents a unique and dangerous threat to users of WordWebSoftware’s Crossword Compiler Puzzles. This vulnerability allows unrestricted upload of files with dangerous types, namely, it permits threat actors to upload a web shell to a web server, potentially leading to system compromise or data leakage. Given the popularity of the affected software, this vulnerability poses a significant threat that cannot be ignored.
Vulnerability Summary
CVE ID: CVE-2025-46490
Severity: Critical, CVSS score 9.9
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: System compromise, data leakage
Affected Products
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Product | Affected Versions
Crossword Compiler Puzzles | n/a – 5.2
How the Exploit Works
The exploit hinges on the software’s lax file handling. An attacker can submit a malicious file disguised as a harmless crossword puzzle or other expected file type. Once uploaded, the attacker can execute this file to deploy a web shell, a script that enables remote administration of the affected server. From there, they can manipulate the system, potentially compromising it or extracting sensitive data.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited:
POST /upload/crossword HTTP/1.1
Host: target.example.com
Content-Type: application/octet-stream
{ "file": "malicious_shell.php" }In this example, the attacker sends a POST request to the upload endpoint of the targeted server. They attach a malicious PHP file, disguised as a harmless crossword puzzle. Once uploaded, the attacker can access this file to execute the web shell, gaining control over the server.
Mitigation Guidance
To mitigate the vulnerability, users of Crossword Compiler Puzzles should apply the vendor-provided patch as soon as it is available. However, until the patch is released, users can use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. These tools can help detect and block attempts to exploit this vulnerability. Additionally, users should be wary of any unfamiliar files and always verify their sources before downloading or uploading them.
Remember, as a last resort, the safest solution is to stop using the affected versions of the software until a patch is available. Cybersecurity is a shared responsibility, and every user has a role to play in keeping systems and data safe.