CVE-2026-1555CRITICAL 9.8EPSS p57.7%

CVE-2026-1555CVE-2026-1555

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.98% probability of exploitation · percentile 57.7% · 2026-06-19T12:03:05Z
Published2026-04-15
Last modified2026-04-22

Underlying weaknesses· 1

CWE-434

References

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

1

TypeTargetConfidenceTier
WeaknessUnrestricted Upload of File with Dangerous Typecwe-4340%live

Related by meaning· 6

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.