Observable Response Discrepancy in Shopware - CVE-2026-31888
Published: May 20, 2026
Vulnerability identifier: #VU131907
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-31888
CWE-ID: CWE-204
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 enumerate valid customer accounts.
The vulnerability exists due to observable response discrepancy in the Store API login endpoint when handling login requests. A remote attacker can submit crafted login attempts with probed email addresses to enumerate valid customer accounts.
The unknown-email response reflects the submitted email address in the error detail and metadata.
How to mitigate CVE-2026-31888
Install security update from vendor's website.