Arbitrary Payment Action Vulnerability in Sylius by Sylius
CVE-2026-100869

8.2HIGH

Key Information:

Vendor

Sylius

Status
Sylius
Vendor
CVE Published:
27 September 2026

What is CVE-2026-100869?

Sylius versions prior to 2.1.16 and 2.2.9 have a vulnerability in the Shop API that fails to appropriately restrict payment request actions. This flaw allows customers with order tokens to initiate unauthorized payment actions, including refunds, on completed orders. Such actions can lead to considerable financial losses as payment gateways are manipulated into processing these requests while Sylius continues to regard the respective orders as paid.

Affected Version(s)

Sylius 2.0.0 < 2.1.16

Sylius 2.2.0 < 2.2.9

References

https://github.com/Sylius/Sylius/security/advisories/GHSA...
vendor-advisory
https://github.com/Sylius/Sylius/pull/19214
patchissue-tracking
https://github.com/Sylius/Sylius/commit/5813831f60f3a60b7...
patch

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Alfonsas Cirtautas
.