CVE-2026-31821
MEDIUM
GHSA-wjmg-4cq5-m8hg
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
3Description
Sylius is an Open Source eCommerce Framework on Symfony. The POST /api/v2/shop/orders/{tokenValue}/items endpoint does not verify cart ownership. An unauthenticated attacker can add items to other registered customers' carts by knowing the cart tokenValue. An attacker who obtains a cart tokenValue can add arbitrary items to another customer's cart. The endpoint returns the full cart representation in the response (HTTP 201). The issue is fixed in versions: 2.0.16, 2.1.12, 2.2.3 and above.
Analysis
Sylius eCommerce framework's cart API endpoint fails to validate cart ownership, allowing unauthenticated attackers to add items to other customers' shopping carts if they possess a valid cart token value. This integrity flaw affects registered users whose carts can be manipulated by external threat actors, potentially leading to fraudulent transactions or operational disruption. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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External POC / Exploit Code
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