CVE-2026-1555

CRITICAL 9.8

WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

CVSS Score

9.8

EPSS Score

0.1%

EPSS Percentile

30th

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.

CWE	CWE-434
Vendor	owen
Product	webstack
Published	Apr 15, 2026
Last Updated	Apr 15, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Owen / WebStack

0 ≤ 1.2024

References

NVD ↗ CVE.org ↗ EPSS Data ↗

wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/b97805de-1b47-4c9f-baae-2e37c1b78570?source=cve github.com: https://github.com/owen0o0/WebStack/blob/master/inc/ajax.php#L5 github.com: https://github.com/owen0o0/WebStack/tree/master

Credits

Chiao-Lin Yu