How severe is CVE-2026-31821?

CVE-2026-31821 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-31821 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31821?

CVE-2026-31821 affects Sylius. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31821?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-31821 have an EU (EUVD) identifier?

Yes. CVE-2026-31821 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10914.

When was CVE-2026-31821 published?

CVE-2026-31821 was published on 2026-03-10 and last updated on 2026-06-17.

CVE-2026-31821

CVE-2026-31821 is a medium-severity vulnerability in Sylius with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10914
Weakness: CWE-862
Affected product: Sylius
Published: 2026-03-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-31821?: CVE-2026-31821 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-31821 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31821?: CVE-2026-31821 affects Sylius. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31821?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-31821 have an EU (EUVD) identifier?: Yes. CVE-2026-31821 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10914.
When was CVE-2026-31821 published?: CVE-2026-31821 was published on 2026-03-10 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:sylius:sylius:*:*:*:*:*:*:*:*

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