Vulnerability record · CVE-2026-53599 · published 31 July 2026

CVE-2026-53599: Unrestricted file upload vulnerability

REDAXO is a PHP-based content management system. From 5.18.2 until 5.21.1, rex_mediapool::isAllowedExtension in redaxo/src/addons/mediapool/lib/mediapool.php lets an authenticated backend user with media[upload] permission upload a JPEG/PHP polyglot named shell.php.any.jpg, which web servers with multi-extension PHP handlers can execute as the web-server user. This issue is fixed in version 5.21.1.

7.5 CVSS 3.1 High EPSS 0.51% · top 59.0% CWE-434 · Unrestricted file upload Deferred

7.5CVSS 3.1 base score

0.51%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

5References

9 Sep 2026Last modified by NVD

Description

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

References

Link	Tags
https://github.com/redaxo/core/commit/462e36896bb65d292ba22d711044c23c9cfb0340
https://github.com/redaxo/core/pull/6538
https://github.com/redaxo/core/releases/tag/5.21.1
https://github.com/redaxo/core/security/advisories/GHSA-98pp-vccm-qm25
https://github.com/redaxo/core/security/advisories/GHSA-98pp-vccm-qm25

Track CVE-2026-53599 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

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

10.0CVE-2026-56291Balbooa Forms Joomla extension unauthenticated arbitrary file upload RCEThe Balbooa Forms extension for Joomla before version 2.4.1 accepts file uploads without authentication and does not restrict file type, allowing exe…KEVEPSS 15%analysed9 Jul 2026 10.0CVE-2026-48939iCagenda Joomla extension unrestricted file upload leads to PHP RCEThe iCagenda extension for Joomla fails to restrict file types in its file attachment feature, allowing arbitrary file uploads that result in PHP cod…KEVEPSS 20%analysed20 Jun 2026 10.0CVE-2026-56290Joomla Page Builder CK unauthenticated file upload leads to RCEThe Joomla Page Builder CK extension before 3.6.0 allows unauthenticated arbitrary file uploads, letting an attacker place executable files on the se…KEVEPSS 31%analysed29 Jun 2026 10.0CVE-2026-48908SP Page Builder for Joomla unauthenticated arbitrary file upload RCESP Page Builder for Joomla permits unauthenticated users to upload arbitrary files, which can lead to upload and execution of PHP code. The flaw is a…KEVEPSS 89%analysed20 Jun 2026 9.8CVE-2024-7399Samsung MagicINFO 9 Server path traversal allows arbitrary file writeSamsung MagicINFO 9 Server before version 21.1050 contains a path traversal flaw (CWE-22) that also enables unrestricted file upload (CWE-434), letti…KEVEPSS 92%analysed12 Aug 2024 7.2CVE-2025-2749Kentico Xperience path traversal and file upload lead to RCEKentico Xperience through 13.0.178 allows an authenticated Staging Sync Server user to upload arbitrary data to relative paths, enabling path travers…KEVEPSS 4.1%analysed24 Mar 2025 7.2CVE-2024-7694ThreatSonar Anti-Ransomware unrestricted file upload enables command executionThreatSonar Anti-Ransomware from TeamT5 fails to properly validate the content of uploaded files (CWE-434). An attacker holding administrator privile…KEVEPSS 1.8%analysed12 Aug 2024 10.0CVE-2025-52691SmarterMail unauthenticated arbitrary file upload leading to RCESmarterTools SmarterMail contains an unrestricted file upload flaw (CWE-434) that lets an unauthenticated attacker write files to any location on the…KEVEPSS 86%analysed29 Dec 2025

Source: NIST National Vulnerability Database (record CVE-2026-53599), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.