Vulnerabilities

Threat intelligence · CVE-2026-48012

Shopware SSO referer trust leading to an arbitrary redirect target

Published May 19, 2026 · catalog updated May 20, 2026 · Shopware SSO referer trust

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-48012. EPSS is 0.27%. Act only if a listed version of Shopware SSO referer trust is installed.

Severity

Medium4.3

Known exploitation

Not in CISA/VulnCheck KEV

EPSS

0.27%

Remediation

Version ranges on file

Affected products

composer shopware/core · composer shopware/platform

## Description This report describes an open redirect in Shopware's public SSO entry point at . When the endpoint is reached without the expected SSO session state, the application falls back to the request's header and uses that value as the redirect destination. In the validated behavior, the server does not restrict that fallback target to same-origin URLs, does not require a relative path, and does not reject dangerous schemes such as . As a result, an unauthenticated request can turn this endpoint into a reusable redirect primitive whose destination is fully controlled by attacker-supplied request metadata. The security problem is not limited to a harmless navigation mismatch. The endpoint sits under , which gives the redirect a trustworthy application-controlled origin and makes it suitable for phishing chains, branded redirect abuse, and cases where client software automatically follows redirects issued by a trusted host. The attached evidence also shows that the response is not only an HTTP with a user-controlled header. The HTML body contains a matching meta refresh tag and redirect link built from the same attacker-controlled value. In the validated proof, the endpoint redirects to when that URL is supplied through , and it also reflects into and the HTML redirect body without any scheme filtering. This report therefore stays conservative and claims an open redirect with arbitrary redirect targets, while noting that the lack of scheme restrictions makes the behavior materially worse than a same-scheme external redirect. ## Steps To Reproduce 1. Start a local Shopware instance that exposes the vulnerable endpoint at . No login is required for the proof. The attached Python PoC already targets that base URL and is configured to send direct requests without following redirects automatically. 2. Run the attached PoC with . The script sends three requests to and records the raw responses as evidence files. The first request omits the header entirely. The second