CVE-2026-31822
MEDIUM
GHSA-vgh8-c6fp-7gcg
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Description
Sylius is an Open Source eCommerce Framework on Symfony. A cross-site scripting (XSS) vulnerability exists in the shop checkout login form handled by the ApiLoginController Stimulus controller. When a login attempt fails, AuthenticationFailureHandler returns a JSON response whose message field is rendered into the DOM using innerHTML, allowing any HTML or JavaScript in that value to be parsed and executed by the browser. The issue is fixed in versions: 2.0.16, 2.1.12, 2.2.3 and above.
Analysis
Stored XSS in Sylius checkout login form allows unauthenticated attackers to inject malicious scripts through authentication error messages that are unsafely rendered via innerHTML. An attacker can craft a failed login attempt containing JavaScript payload that executes in the browser of any user viewing the checkout page, potentially stealing session tokens or credentials. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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