REDAXO allows Authenticated Reflected Cross Site Scripting - packages installation

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

• CVE-2025-27412: 0.29% estimated exploitation activity in the next 30 days; percentile 21.36 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Reflected cross-site scripting (XSS) is a type of web vulnerability that occurs when a web application fails to properly sanitize user input, allowing an attacker to inject malicious code into the application's response to a user's request. When the user's browser receives the response, the malicious code is executed, potentially allowing the attacker to steal sensitive information or take control of the user's account. Details On the latest version of Redaxo, v5.18.2, the rex-api-result parameter is vulnerable to Reflected cross-site scripting (XSS) on the page of AddOns. PoC 1. Login Redaxo as administrative user. 2. Navigate to the URL: http://localhost/redaxo/index.php?page=packages&rex-api-call=package&&rex-api-result={%22succeeded%22%3Atrue%2C%22message%22%3A%22%3Cimg%20src=x%20onerror=alert(document.domain);%3E%22};%3E%22%7D), the XSS executes. Impact This can lead to various security risks, including session hijacking, phishing attacks and malware distribution.…

Published by the source

5 Mar 2025, 19:03 UTC

Last modified by the source

5 Mar 2025, 19:03 UTC

Source last checked

26 Oct 2026, 14:29 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-8366-xmgf-334f

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# Patch Next advisory brief: CVE-2025-27412

Advisory: REDAXO allows Authenticated Reflected Cross Site Scripting - packages installation
IDs: CVE-2025-27412, GHSA-8366-xmgf-334f
Record: https://patchnext.com/advisories/cve-2025-27412 (revision 1, source checked 26 Oct 2026, 14:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: redaxo/source 5.18.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist redaxo/source: affected >= 5.0.0, < 5.18.3; fixed in 5.18.3

## Suggested inspection (read-only)
- Packagist redaxo/source: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on redaxo/source.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-8366-xmgf-334f (GitHub-reviewed advisory GHSA-8366-xmgf-334f lists affected ranges: Packagist redaxo/source >=5.0.0 <5.18.3)

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