CVE-2026-84750Network attack vectorHinoki check available

Site takeover via unrestricted signature-field upload

Published Sep 19, 2026 · Updated Sep 19, 2026

Arbitrary file upload in Themefic Ultra Addons for Contact Form 7 before 3.5.51 allows remote attackers to store files at a public path. The signature field accepts a file without checking its type or extension and preserves the supplied extension at a predictable URL. Unauthenticated form access is sufficient; .phar executes as PHP on default Debian and Ubuntu Apache stacks, enabling site takeover, while other stacks expose stored cross-site scripting.

CVSS severity6.5
Medium
EPSS probability0.45%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Arbitrary file upload in Themefic Ultra Addons for Contact Form 7 before 3.5.51 allows remote attackers to store files at a public path. The signature field accepts a file without checking its type or extension and preserves the supplied extension at a predictable URL. Unauthenticated form access is sufficient; .phar executes as PHP on default Debian and Ubuntu Apache stacks, enabling site takeover, while other stacks expose stored cross-site scripting.

The record

CVE
CVE-2026-84750
Published
Sep 19, 2026
Updated
Sep 19, 2026
Vendor
Themefic
Product
Ultra Addons for Contact Form 7
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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=3.2.4 <3.5.51

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Themefic · Ultra Addons for Contact Form 7version=3.2.4 <3.5.51

Published CVSS scores

6.5CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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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