Stored Cross-Site Scripting Issue in REDAXO by Perluet
CVE-2026-116900

5.1MEDIUM

Key Information:

Vendor

Redaxo

Status
Core
Vendor
CVE Published:
27 October 2026

What is CVE-2026-116900?

In REDAXO versions prior to 5.21.4, a stored cross-site scripting (XSS) vulnerability exists that enables content editors to inject malicious HTML. This flaw arises from the application failing to properly escape values rendered by media, medialist, link, and linklist widgets. Attackers can exploit this weakness by submitting specially crafted REX_INPUT_MEDIA or REX_INPUT_LINK values, which can execute scripts within administrators' backend sessions, potentially allowing unauthorized access to admin accounts.

Affected Version(s)

core 0 < 5.21.4

core 5.21.4

References

https://github.com/redaxo/core/security/advisories/GHSA-5...
vendor-advisory
https://www.vulncheck.com/advisories/redaxo-before-5.21.4...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

V-C-Williams
.