Medium severity · published Mar 10, 2026
CVE-2026-31821
Sylius is Missing Authorization in API v2 Add Item Endpoint
5.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SY
Sylius · Sylius
>= 2.2.0, < 2.2.3; >= 2.1.0, < 2.1.12; >= 2.0.0, < 2.0.16 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31821
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-31821
Mitigation
https://github.com/Sylius/Sylius/security/advisories/GHSA-wjmg-4cq5-m8hg
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