Vulnerability · Published Oct 27, 2026 · Assigned by VulnCheck

CVE-2026-117535REDAXO before 5.21.3 Reflected XSS via opener_link in Media Pool

Medium 6.1

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 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.2%top 90.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
redaxo	core	0 – before 5.21.3

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

References

GitHub Security Advisory (GHSA-5293-gg47-5xmh) vendor-advisory
VulnCheck Advisory: REDAXO before 5.21.3 Reflected XSS via opener_link in Media Pool third-party-advisory