CVE-2026-31821

Sylius is Missing Authorization in API v2 Add Item Endpoint

State: Published
Severity: 6.9 Medium
Published: Mar 10, 2026
Updated: Mar 11, 2026
Reserved: Mar 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
SyliusSylius	>= 2.2.0, < 2.2.3Affected >= 2.1.0, < 2.1.12Affected >= 2.0.0, < 2.0.16Affected

References

https://github.com/Sylius/Sylius/security/advisories/GHSA-wjmg-4cq5-m8hg

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