Vulnerability Details CVE-2026-31821
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 17.5%
CVSS Severity
CVSS v3 Score 5.3
Products affected by CVE-2026-31821
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cpe:2.3:a:sylius:sylius:*
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cpe:2.3:a:sylius:sylius:2.0.0
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cpe:2.3:a:sylius:sylius:2.0.1
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cpe:2.3:a:sylius:sylius:2.0.10
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cpe:2.3:a:sylius:sylius:2.0.11
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cpe:2.3:a:sylius:sylius:2.0.12
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cpe:2.3:a:sylius:sylius:2.0.13
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cpe:2.3:a:sylius:sylius:2.0.2
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cpe:2.3:a:sylius:sylius:2.0.3
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cpe:2.3:a:sylius:sylius:2.0.4
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cpe:2.3:a:sylius:sylius:2.0.5
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cpe:2.3:a:sylius:sylius:2.0.6
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cpe:2.3:a:sylius:sylius:2.0.7
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cpe:2.3:a:sylius:sylius:2.0.8
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cpe:2.3:a:sylius:sylius:2.0.9
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cpe:2.3:a:sylius:sylius:2.1.0
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cpe:2.3:a:sylius:sylius:2.1.1
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cpe:2.3:a:sylius:sylius:2.1.2
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cpe:2.3:a:sylius:sylius:2.1.3
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cpe:2.3:a:sylius:sylius:2.1.4
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cpe:2.3:a:sylius:sylius:2.1.5
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cpe:2.3:a:sylius:sylius:2.1.6