What is CVE-2025-66026?

CVE-2025-66026 is a medium-severity vulnerability in Redaxo, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-11-26.

How severe is CVE-2025-66026?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Redaxo

CVE-2025-66026

REDAXO is a PHP-based CMS. Prior to version 5.20.1, a reflected Cross-Site Scripting (XSS) vulnerability exists in the Mediapool view where the request parameter args[types] is rendered into an info banner without HTML-escaping. This allows arbitrary JavaScript execution in the backend context when an authenticated user visits a crafted link while logged in. This issue has been patched in version 5.20.1.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (17.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Redaxo — versions < 5.20.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2025-66026?: CVE-2025-66026 is a medium-severity vulnerability in Redaxo, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-11-26.
How severe is CVE-2025-66026?: Medium severity. CVSS v3 base score is 6.1 out of 10.