CVE-2026-1555

WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

CVSS 9.8 CRITICALEPSS 1.0%CWE-434

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.

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

Affected products

Owen · WebStack

public PoCs found — 2

githubgithub.com/willygailo/WG-CVE-2026-1555-Linux★ 0 githubgithub.com/webshellseo8/CVE-2026-1555-POC★ 0

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References

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