CVE-2026-15158Network attack vector

Unauthenticated code execution via double-extension file upload

Published Jul 9, 2026 · Updated Jul 9, 2026

Arbitrary file upload in Creative Themes Blocksy Companion 2.1.46 and earlier allows remote attackers to upload executable files via crafted names. The Custom Fonts wp_check_filetype_and_ext filter uses strpos() to accept .woff2 or .ttf anywhere in a name, so save_attachments accepts double-extension PHP files. Exploitation requires blocksy-companion-pro with WooCommerce Extra Advanced Reviews and Custom Fonts active; code execution also requires server-side execution of the uploaded file type.

CVSS severity9.8
Critical
EPSS probability1.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Creative Themes Blocksy Companion 2.1.46 and earlier allows remote attackers to upload executable files via crafted names. The Custom Fonts wp_check_filetype_and_ext filter uses strpos() to accept .woff2 or .ttf anywhere in a name, so save_attachments accepts double-extension PHP files. Exploitation requires blocksy-companion-pro with WooCommerce Extra Advanced Reviews and Custom Fonts active; code execution also requires server-side execution of the uploaded file type.

The record

CVE
CVE-2026-15158
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Creative Themes
Product
Blocksy Companion
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.1.46

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Creative Themes · Blocksy Companionversion=0 <=2.1.46

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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