Vulnerability details
CVE-2026-53599
redaxo core
Redaxo has a Mediapool isAllowedExtension bypass via multi-segment filename that leads to authenticated RCE on Apache mod_php multi-extension handlers
CVSS 3.1
7.5High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| redaxo | core | >= 5.18.2, < 5.21.1 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://github.com/redaxo/core/pull/6538 x_refsource_MISC
- https://github.com/redaxo/core/commit/462e36896bb65d292ba22d711044c23c9cfb0340 x_refsource_MISC
- https://github.com/redaxo/core/releases/tag/5.21.1 x_refsource_MISC
- https://github.com/redaxo/core/security/advisories/GHSA-98pp-vccm-qm25 x_refsource_CONFIRM
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Details
- Published
- 2026-07-31
- Last updated
- 2026-08-01
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.5%
Probability of exploitation in 30 days
43.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-434Unrestricted Upload of File with Dangerous Type