What is CVE-2026-9421?

CVE-2026-9421 is a high-severity vulnerability in Klik Socialmediawebsite, classified under Improper Access Control. CVSS score: 7.3/10. Published 2026-05-25.

How severe is CVE-2026-9421?

High severity. CVSS v3 base score is 7.3 out of 10.

Arbitrary file upload in Klik Socialmediawebsite

CVE-2026-9421

A vulnerability was determined in KLiK SocialMediaWebsite 1.0. This vulnerability affects the function uniqid of the file upload.inc.php of the component File Handler. This manipulation causes unrestricted upload. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized.

Published 2026-05-25 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.005 (40.5th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

Klik Socialmediawebsite — versions 1.0

Weakness classification (CWE)

References

vuldb.com/vuln/365402 (technical-description, vdb-entry)
vuldb.com/vuln/365402/cti (signature, permissions-required)
vuldb.com/submit/813725 (third-party-advisory)

Frequently asked questions

What is CVE-2026-9421?: CVE-2026-9421 is a high-severity vulnerability in Klik Socialmediawebsite, classified under Improper Access Control. CVSS score: 7.3/10. Published 2026-05-25.
How severe is CVE-2026-9421?: High severity. CVSS v3 base score is 7.3 out of 10.