CVE-2026-53599

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Source
https://cve.org/CVERecord?id=CVE-2026-53599
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53599.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-53599
Aliases
Published
2026-07-31T19:43:15.663Z
Modified
2026-08-02T03:47:49.623470848Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Redaxo has a Mediapool isAllowedExtension bypass via multi-segment filename that leads to authenticated RCE on Apache mod_php multi-extension handlers
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-434"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53599.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/redaxo/core

Affected ranges

Type
GIT
Repo
https://github.com/redaxo/core
Events
Introduced
fdd41fcc9acb3cddb80b3f4098c820709193f457
Fixed
462e36896bb65d292ba22d711044c23c9cfb0340
Fixed
a70ea49624f291319cfe66dd9b53200e25cd3bcd
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "5.18.2"
        },
        {
            "fixed": "5.21.1"
        }
    ]
}

Affected versions

5.*
5.18.2
5.18.3
5.19.0
5.20.0
5.20.1
5.20.2
5.21.0
5.21.0-beta1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53599.json"