CVE-2026-117538

Medium

Description

REDAXO before 5.21.0 contains a reflected cross-site scripting vulnerability in the backend packages API, where the function parameter is concatenated into an error message rendered without HTML escaping. Attackers can lure an authenticated backend user to a crafted link containing a valid CSRF token, executing JavaScript that performs same-origin actions or reads DOM data.

SeverityMedium

CVSS4.1

Exploit probability—

ProductRedaxo/source

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

redaxo/source5.21.0 or later

Vendor advisories

github.com/redaxo/core/security/advisories/GHSA-xq4j-g85q-wf97

Affected products

Product	Affected versions	Fixed in
redaxo/sourcePackagist	v < 5.21.0	5.21.0

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