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Vulnerability record · CVE-2026-48946 · published 25 June 2026

CVE-2026-48946: Joomlaworks k2 unrestricted file upload vulnerability

Joomlaworks · K2

The K2 frontend article-attachment upload path accepts files whose extension is `.php`, and Apache's standard mod_php matches `\.php$` and executes them under the K2 web user. A K2 Author can upload a `shell.php`, then fetch `/media/k2/attachments/shell.php` and execute arbitrary PHP code in the web server's context.

6.3 CVSS 3.1 Medium EPSS 0.28% · top 81.3% CWE-434 · Unrestricted file upload
6.3CVSS 3.1 base score
0.28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
28 Jun 2026Last modified by NVD

Description

The K2 frontend article-attachment upload path accepts files whose extension is `.php`, and Apache's standard mod_php matches `\.php$` and executes them under the K2 web user. A K2 Author can upload a `shell.php`, then fetch `/media/k2/attachments/shell.php` and execute arbitrary PHP code in the web server's context.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.getk2.org/ Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-19634Verot project verot unrestricted file upload vulnerabilityclass.upload.php in verot.net class.upload through 1.0.3 and 2.x through 2.0.4, as used in the K2 extension for Joomla! and other products, omits .ph…EPSS 4.2%9.8CVE-2019-19576Verot project verot unrestricted file upload vulnerabilityclass.upload.php in verot.net class.upload before 1.0.3 and 2.x before 2.0.4, as used in the K2 extension for Joomla! and other products, omits .phar…EPSS 26%7.5CVE-2018-7482Joomlaworks k2 path traversal vulnerabilityThe K2 component 2.8.0 for Joomla! has Incorrect Access Control with directory traversal, allowing an attacker to download arbitrary files, as demons…EPSS 2.3%6.5CVE-2026-48941Joomlaworks k2 missing authorization vulnerabilityThe K2 frontend `item.checkin` task accepts an unauthenticated `sigProFolder` query parameter and uses it directly to address a `JFolder::delete()` c…EPSS 0.27%6.5CVE-2026-48943Joomlaworks k2 mass assignment vulnerabilityK2 ≤ 2.24 contains a mass-assignment defect in the K2 system user plugin `plg_user_k2`. A Registered Joomla user, by including the field `K2UserForm=…EPSS 0.30%6.5CVE-2026-48944Joomlaworks k2 path traversal vulnerabilityThe K2 frontend article-save handler accepts an `attachment[N][existing]` POST field that is concatenated with `JPATH_SITE/` and passed to `JFile::co…EPSS 0.44%6.1CVE-2026-48942Joomlaworks k2 cross-site scripting vulnerabilityK2 ≤ 2.26 renders the `#__k2_users.image` column directly into HTML `src` attributes via two distinct templates, in both cases without HTML escaping.EPSS 0.25%5.3CVE-2026-48945Joomlaworks k2 unrestricted file upload vulnerabilityThe K2 article gallery upload path accepts a zip/tar archive, extracts it under `/media/k2/galleries/<id>/`, and only renames image files (gif/jpg/jp…EPSS 0.33%

Source: NIST National Vulnerability Database (record CVE-2026-48946), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.