CVE-2026-58480Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via double-extension upload

Published Jul 8, 2026 · Updated Jul 8, 2026

Unrestricted file upload in Creative Themes Blocksy Companion before 2.1.47 allows remote attackers to execute PHP via crafted filenames. The Advanced Reviews save_attachments handler passes uploads through a Custom Fonts strpos() substring check that accepts .woff2 anywhere in the filename rather than validating the final extension. Exploitation requires the Pro code paths with Advanced Reviews and Custom Fonts active and a server configured to execute uploaded PHP.

CVSS severity9.2
Critical
EPSS probability3.57%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Creative Themes Blocksy Companion before 2.1.47 allows remote attackers to execute PHP via crafted filenames. The Advanced Reviews save_attachments handler passes uploads through a Custom Fonts strpos() substring check that accepts .woff2 anywhere in the filename rather than validating the final extension. Exploitation requires the Pro code paths with Advanced Reviews and Custom Fonts active and a server configured to execute uploaded PHP.

The record

CVE
CVE-2026-58480
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
Creative Themes
Product
Blocksy Companion
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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

9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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