XSS in Redaxo Core
CVE-2026-117538
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/redaxo/core/security/advisories/GHSA-xq4j-g85q-wf97 (vendor-advisory)
- www.vulncheck.com/advisories/redaxo-before-5.21.0-reflected-xss-via-packages-ap… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-117538?
- CVE-2026-117538 is a medium-severity vulnerability in Redaxo Core, classified under Cross-site Scripting. CVSS score: 4.1/10. Published 2026-10-27.
- How severe is CVE-2026-117538?
- Medium severity. CVSS v3 base score is 4.1 out of 10.