CVE-2026-53599
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.40% probability · 33th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-434
- Source
- security-advisories@github.com
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.