CVE-2026-1555CWE-434

WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

Critical · published April 15, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
62.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00984 · 62.0th percentile
Weakness
CWE-434 · Unrestricted Upload of File with Dangerous Type
Published
2026-04-15T03:37Z
EPSS history
Timeline
  • 15 APR 03:37Z
    WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload
    cvelistv5