Vulnerability · Published Oct 27, 2026 · Assigned by VulnCheck

CVE-2026-117537REDAXO before 5.21.0 Reflected XSS via Metainfo API type Parameter

Medium 4.1

In plain English

A medium-severity cross-site scripting in core from redaxo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.1Medium

Exploit odds (30 days)0.2%top 92.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

REDAXO before 5.21.0 contains a reflected cross-site scripting vulnerability that allows authenticated attackers to inject scripts via the type parameter of the metainfo_default_fields_create API. Attackers can craft a link with a valid CSRF token and HTML payload that rex_view::message() renders unescaped, executing scripts in a victim's backend session.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	redaxo/source	5.21.0	GHSA-m662-8jrj-cw6v

Affected products (as reported)

Vendor	Product	Versions
redaxo	core	0 – before 5.21.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L

References

GitHub Security Advisory (GHSA-m662-8jrj-cw6v) vendor-advisory
VulnCheck Advisory: REDAXO before 5.21.0 Reflected XSS via Metainfo API type Parameter third-party-advisory