CVE-2026-1555

WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

9.8 CriticalPublic exploit

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.98%Up 0.9 points since Apr 15, 2026

What each source reports

CVE List Score used 9.8

WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

Record: CVE-2026-1555
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

EUVDEUVD-2026-22830 9.8

Record: EUVD-2026-22830
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-5c49-p8m3-fjh3 9.8

The WebStack theme for WordPress is vulnerable to arbitrary file uploads due to missing file type...

Record: GHSA-5c49-p8m3-fjh3
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

NVD 9.8

Record: CVE-2026-1555
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

OSV 9.8

WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

Record: CVE-2026-1555
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

Affected products

owen webstack

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	Nxploited/CVE-2026-1555	2026-04-17
PoC in GitHub	katranSefa/CVE-2026-1555	2026-09-02
PoC in GitHub	willygailo/WG-CVE-2026-1555-Linux	2026-06-08

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-1555 is a critical vulnerability (CVSS 9.8) in Owen Webstack, published April 15, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.98%, the 62nd percentile. No source names a fixed version.