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CVE-2026-1555

CriticalPublished

WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

Published: Apr 15, 2026
Updated: Apr 15, 2026
Assigning CNA: Wordfence
Evidence observed: Aug 28, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 60.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The WebStack theme for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the io_img_upload() function in all versions up to, and including, 1.2024. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

Sources

CVE-2026-1555Exploit
WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload
WG-CVE-2026-1555-LinuxExploit
Automated exploit toolkit for CVE-2026-1555, a critical unauthenticated file upload RCE in the WebStack WordPress theme. Features PyQt5 GUI, dork-based target discovery, and a multi-feature PHP webshell for post-exploitation.
CVE-2026-1555PoC
Exploit code for CVE-2026-1555, a proof-of-concept demonstrating the vulnerability.

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