Sylius
CVE-2026-31822
MEDIUM
GHSA-vgh8-c6fp-7gcg
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
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. The vulnerability affects Sylius versions prior to 2.0.16, 2.1.12, and 2.2.3, with no current patch available for older releases.
Technical ContextAI
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Sylius. 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.
RemediationAI
Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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