CVE-2026-1555 WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

Q: What is CVE-2026-1555?

CVE-2026-1555 is a critical vulnerability in Owen WebStack, published on 15 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Q: Is CVE-2026-1555 being exploited?

There is no known exploitation of CVE-2026-1555 in the wild and no public exploit code.

Q: How do I fix CVE-2026-1555?

No fix has been published for CVE-2026-1555 yet. Limit exposure of the affected software until one is available.

Critical 9.8 Published 15 Apr 2026 Updated 15 Apr 2026

Unauthenticated attackers can upload arbitrary files via the WebStack WordPress theme, potentially leading to remote code execution.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-1555?

CVE-2026-1555 is a critical vulnerability in Owen WebStack, published on 15 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-434

Which versions are affected by CVE-2026-1555?

How do I fix CVE-2026-1555?

No fix has been published for CVE-2026-1555 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-1555 being exploited?

There is no known exploitation of CVE-2026-1555 in the wild and no public exploit code.

Public exploit code: 2 proofs of concept on GitHub.

Sources

Also known as GHSA-5c49-p8m3-fjh3.