Input validation error in Shopware - #VU131950
Published: May 20, 2026
Vulnerability identifier: #VU131950
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Shopware
Affected software:
Shopware
Shopware
Detailed vulnerability description
The vulnerability allows a remote attacker to redirect users to an arbitrary URL.
The vulnerability exists due to improper input validation in the GET /api/oauth/sso/auth endpoint when handling requests without the expected SSO session state. A remote attacker can supply a crafted Referer header to redirect users to an arbitrary URL.
User interaction is required, and the endpoint also reflects the attacker-controlled target into the Location header and the HTML redirect body, including dangerous schemes such as javascript:.
Remediation
Install security update from vendor's website.