XSS in Redaxo Core
CVE-2026-117535
REDAXO before 5.21.3 contains a reflected cross-site scripting vulnerability in the backend media pool detail page, where the opener_link parameter is rendered without HTML escaping. Unauthenticated attackers can lure logged-in backend users with media permissions into clicking a crafted link. The injected script can then read the CSRF token and perform actions with the victim's permissions, including code execution via template or module edits when the victim is an administrator.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
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.
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-5293-gg47-5xmh (vendor-advisory)
- www.vulncheck.com/advisories/redaxo-before-5.21.3-reflected-xss-via-opener-link… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-117535?
- CVE-2026-117535 is a medium-severity vulnerability in Redaxo Core, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-27.
- How severe is CVE-2026-117535?
- Medium severity. CVSS v3 base score is 6.1 out of 10.