XSS in Redaxo Core
CVE-2026-116900
REDAXO before 5.21.4 contains a stored cross-site scripting vulnerability that allows content editors to inject HTML by storing unescaped values rendered by media, medialist, link and linklist widgets. Attackers can submit crafted REX_INPUT_MEDIA or REX_INPUT_LINK values that break out of the value attribute, executing script in administrators' backend sessions to hijack accounts.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/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-5wmj-5x79-rr87 (vendor-advisory)
- www.vulncheck.com/advisories/redaxo-before-5.21.4-stored-xss-via-media-and-link… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116900?
- CVE-2026-116900 is a medium-severity vulnerability in Redaxo Core, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-27.
- How severe is CVE-2026-116900?
- Medium severity. CVSS v3 base score is 5.4 out of 10.