Vulnerability · Published Oct 27, 2026 · Assigned by VulnCheck

CVE-2026-116900REDAXO before 5.21.4 Stored XSS via Media and Link Input Widgets

Medium 5.4

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 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.1%top 96.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
redaxo	core	0 – before 5.21.4

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

References

GitHub Security Advisory (GHSA-5wmj-5x79-rr87) vendor-advisory
VulnCheck Advisory: REDAXO before 5.21.4 Stored XSS via Media and Link Input Widgets third-party-advisory