CVE-2026-48946Network attack vector

Authenticated RCE via unrestricted PHP attachment upload

Published Jun 25, 2026 · Updated Jun 25, 2026

Unrestricted file upload in JoomlaWorks K2 1.0 through 2.26 allows remote authenticated users to execute PHP code as the web server. The frontend article-attachment handler accepts a .php filename without blocking dangerous extensions, leaving the file under /media/k2/attachments for Apache mod_php to execute. A K2 Author account and an Apache configuration that executes uploaded PHP files are required; successful exploitation grants code execution in the web server context.

CVSS severity6.3
Medium
EPSS probability0.28%
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 JoomlaWorks K2 1.0 through 2.26 allows remote authenticated users to execute PHP code as the web server. The frontend article-attachment handler accepts a .php filename without blocking dangerous extensions, leaving the file under /media/k2/attachments for Apache mod_php to execute. A K2 Author account and an Apache configuration that executes uploaded PHP files are required; successful exploitation grants code execution in the web server context.

The record

CVE
CVE-2026-48946
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
JoomlaWorks
Product
K2
Classifications
CWE-434, T1505.003, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=1.0-2.26

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

JoomlaWorks · K2version=1.0-2.26

Published CVSS scores

6.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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
T1190Exploit Public-Facing Application

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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