CVE-2026-28133Network attack vector

Authenticated code execution via unrestricted file upload

Published Mar 5, 2026 · Updated Mar 5, 2026

Unrestricted file upload in WP Chill Filr 1.2.14 and earlier allows remote authenticated users to place executable files on a web server. The published advisory identifies Filr's upload handling but does not disclose the handler or validation operation that accepts a dangerous file type. Contributor access is required, and an uploaded web shell permits code execution in the WordPress server context.

CVSS severity8.1
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in WP Chill Filr 1.2.14 and earlier allows remote authenticated users to place executable files on a web server. The published advisory identifies Filr's upload handling but does not disclose the handler or validation operation that accepts a dangerous file type. Contributor access is required, and an uploaded web shell permits code execution in the WordPress server context.

The record

CVE
CVE-2026-28133
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
WP Chill
Product
Filr
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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=n/a <=<= 1.2.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WP Chill · Filrversion=n/a <=<= 1.2.12

Published CVSS scores

8.1GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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