# CVE-2026-9421: KLiK SocialMediaWebsite unrestricted file upload in upload.inc.php

Source: https://junglewise.ai/threats/cve-2026-9421-klik-socialmediawebsite-unrestricted-file-upload-in-upload-inc-php  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-25. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9421 · Severity: high · CVSS 7.3 · Published 2026-05-25

KLiK SocialMediaWebsite 1.0 contains a security flaw in its file handling system. This allows an attacker to upload unauthorized files to the server without any authentication. An exploit could lead to a complete takeover of the website, data theft, or the hosting of malicious content.

Technologies: [KLiK SocialMediaWebsite](https://junglewise.ai/threats/technologies/socialmediawebsite). Vendors: [KLiK](https://junglewise.ai/threats/vendors/klik).

## Quick answers

**Is CVE-2026-9421 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9421 being exploited in the wild.

**How severe is CVE-2026-9421?** High severity, with a CVSS score of 7.3, published 25 May 2026.

**Which products and versions are affected?** KLiK SocialMediaWebsite 1.0.

**Is there a fix for CVE-2026-9421?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-9421 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-9421?** Check whether you run KLiK SocialMediaWebsite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An unrestricted file upload vulnerability exists in KLiK SocialMediaWebsite 1.0 within the File Handler component. The flaw is located in the 'uniqid' function of the 'upload.inc.php' file, which fails to properly validate or restrict the types of files being uploaded. A remote, unauthenticated attacker can exploit this by sending a specially crafted request to upload arbitrary files, such as PHP scripts, to the web server. Successful exploitation allows for remote code execution (RCE) and full system compromise. The exploit has been publicly disclosed.

## Affected products

- KLiK SocialMediaWebsite 1.0

## Timeline

- 2026-05-25: advisory: Initial disclosure by VulDB and NVD
- 2026-05-25: disclosed: Exploit code has been publicly disclosed

## References

- [https://vuldb.com/submit/813725](https://vuldb.com/submit/813725)
- [https://vuldb.com/vuln/365402](https://vuldb.com/vuln/365402)
- [https://vuldb.com/vuln/365402/cti](https://vuldb.com/vuln/365402/cti)

## Related threats

- [KLiK SocialMediaWebsite injection in HTTP POST Request Parameter Handler](https://junglewise.ai/threats/cve-2026-9422-klik-socialmediawebsite-injection-in-http-post-request-parameter)
- [KLiK SocialMediaWebsite injection in HTTP GET Request Parameter Handler](https://junglewise.ai/threats/cve-2026-9420-klik-socialmediawebsite-injection-in-http-get-request-parameter)