Authorization bypass through user-controlled key in Sylius - CVE-2026-31820
Published: April 27, 2026
Vulnerability identifier: #VU128215
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31820
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Sylius
Affected software:
Sylius
Sylius
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to authorization bypass through a user-controlled key in shop LiveComponents when processing user-supplied #[LiveArg] resource identifiers. A remote user can supply a crafted addressId or cartId value to disclose sensitive information.
The issue affects the checkout address FormComponent addressFieldUpdated action and the cart WidgetComponent and SummaryComponent refreshCart actions. The cart-related exposure can include data from completed orders because active carts and completed orders share the same ID space.
How to mitigate CVE-2026-31820
Install security update from vendor's website.