Is CVE-2026-31821 actively exploited?

No active exploitation of CVE-2026-31821 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-31821 be exploited remotely?

Yes. CVE-2026-31821 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-31821?

CVE-2026-31821 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-31821

CWE-862Published: March 10, 2026· Updated: Mar 11, 2026

5.3

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:17.5th

Official 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.

NVD Source

Technical Analysis

CVE-2026-31821 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.