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CVE-2026-31821— Sylius is Missing Authorization in API v2 Add Item Endpoint

Quick assessment

Affected
Sylius Sylius
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sylius是波兰Sylius公司的一套基于Symfony框架的开源电子商务平台。 Sylius存在安全漏洞，该漏洞源于POST /api/v2/shop/orders/{tokenValue}/items端点未验证购物车所有权，可能导致未经验证的攻击者向其他客户的购物车添加商品。以下版本受到影响：2.0.16之前版本、2.1.12之前版本和2.2.3之前版本。

AI Predicted 7.5 Difficulty: Easy EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-31821

Vulnerability Information
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Vulnerability Title
Sylius is Missing Authorization in API v2 Add Item Endpoint
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Sylius 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sylius是波兰Sylius公司的一套基于Symfony框架的开源电子商务平台。 Sylius存在安全漏洞，该漏洞源于POST /api/v2/shop/orders/{tokenValue}/items端点未验证购物车所有权，可能导致未经验证的攻击者向其他客户的购物车添加商品。以下版本受到影响：2.0.16之前版本、2.1.12之前版本和2.2.3之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Sylius Sylius >= 2.2.0, < 2.2.3 -

II. Public POCs for CVE-2026-31821

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III. Intelligence Information for CVE-2026-31821

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Vendor Advisories for CVE-2026-31821 (1)

Same Patch Batch · Sylius · 2026-03-10 · 7 CVEs total

CVE-2026-31824 8.2 HIGH Sylius has a Promotion Usage Limit Bypass via Race Condition
CVE-2026-31825 5.3 MEDIUM Sylius has a DQL Injection via API Order Filters
CVE-2026-31823 4.8 MEDIUM Sylius has Authenticated Stored XSS
CVE-2026-31819 Sylius has an Open Redirect via Referer Header
CVE-2026-31822 Sylius has a XSS vulnerability in checkout login form
CVE-2026-31820 Sylius affected by IDOR in Cart and Checkout LiveComponents

IV. Related Vulnerabilities

Same product: Sylius
Same vendor: Sylius
Same weakness: CWE-862

V. Comments for CVE-2026-31821

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