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CVE-2026-31822

Sylius has a XSS vulnerability in checkout login form

MEDIUM
6.1
CVSS Score
Published: March 10, 2026 at 09:27 PM UTC
Updated: June 17, 2026 at 10:34 AM UTC
1 product affected across 1 vendorSylius

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Sylius· Syliuscomposer
95%
v < 2.0.16v < 2.1.12v < 2.2.32.0.0 ≤ v < 2.0.162.1.0 ≤ v < 2.1.122.2.0 ≤ v < 2.2.3
Affected range stops below 2.0.16, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.2.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMMitigationVendor Advisory
Source: cverecord
https://github.com/Sylius/Sylius/security/advisories/GHSA-vgh8-c6fp-7gcg

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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