CVE-2026-100869

MEDIUM 5.9

Sylius 2.x before 2.1.16 and 2.2.9 Arbitrary Payment Action via Shop API

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

Sylius versions before 2.1.16 and 2.2.9 fail to restrict payment request actions in the Shop API endpoint, allowing customers to trigger refunds on completed orders. Attackers with order tokens can submit arbitrary payment actions like refunds that payment gateways execute while Sylius maintains order as paid, causing financial loss.

CWE	CWE-863
Vendor	sylius
Product	sylius
Published	Sep 27, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

Sylius / Sylius

2.0.0 < 2.1.16 2.2.0 < 2.2.9

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Sylius/Sylius/security/advisories/GHSA-2rv4-pjmm-7fxf github.com: https://github.com/Sylius/Sylius/pull/19214 github.com: https://github.com/Sylius/Sylius/commit/5813831f60f3a60b735a86a57c4b519626a3b75d github.com: https://github.com/Sylius/Sylius/releases/tag/v2.2.9 github.com: https://github.com/Sylius/Sylius vulncheck.com: https://www.vulncheck.com/advisories/sylius-2-x-before-2.1.16-and-2.2.9-arbitrary-payment-action-via-shop-api

Credits

Alfonsas Cirtautas