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

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-27 · updated 2026-10-31
Weakness: CWE-79

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

redaxo core: before 5.21.4 — fixed in 5.21.4

How to fix

Upgrade to a fixed version: redaxo core 5.21.4. Check the vendor advisory for mitigations.

References

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