CVE-2025-27411 is a medium-severity (CVSS 5.4) Unrestricted File Upload vulnerability in redaxo/source. A fix is available for redaxo/source — see the affected versions and patch details below.
REDAXO allows Arbitrary File Upload in the mediapool page
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-27411.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2025-27411 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 389,824 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
redaxo/sourceReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Summary
An arbitrary file upload vulnerability was identified in the redaxo. This flaw permits users to upload malicious files, which can lead to JavaScript code execution and distribute malware.
Details
On the latest version of Redaxo, v5.18.2, the mediapool/media page is vulnerable to arbitrary file upload.
PoC
- Log in to the portal then navigate to
Mediapool. - Upload a png file (ex: poc.png)
- Intercept the upload HTTP request on burp suite and change
filename: poc.1html,Content-Type:image/htmland insert the malicious html code. (ex:<IFRAME SRC="javascript:alert(1);"></IFRAME>)
-
Forward the request.
-
Navigate to the file.
Impact
Exploiting an arbitrary file upload vulnerability enables attackers to execute malicious code on a server.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | redaxo/source | all versions | 5.18.3composer require redaxo/source:^5.18.3 |
Affected Products
redaxoredaxoDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for redaxo/source, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update redaxo/source to 5.18.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-27411 is resolved across your whole dependency graph.
Workarounds
Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.
Frequently Asked Questions
Is CVE-2025-27411 in your dependencies?
Find it across Packagist, including transitive dependencies.