Description
Sylius versions before 2.1.16 and 2.2.9 fail to validate payment amounts during cart recalculation, allowing unauthenticated attackers to modify order totals after gateway transaction initiation. Attackers can pay a small amount, enlarge the order after gateway capture, and have the system mark the inflated order as fully paid while the gateway captured only the original amount.
References7
- github.com/Sylius/Sylius
- github.com/Sylius/Sylius/commit/9e9aeaacbc97b1fc01d573e44d66791…
- github.com/Sylius/Sylius/pull/19216
- github.com/Sylius/Sylius/releases/tag/v2.2.9
- github.com/Sylius/Sylius/security/advisories/GHSA-vv4h-q2x8-74g4
- www.vulncheck.com/advisories/sylius-2-x-before-2.1.16-and-2.2.9…
- github.com/Sylius/Sylius/security/advisories/GHSA-vv4h-q2x8-74g4
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 4.0
-
8.7
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 13 · as of 9 November 2026
- CWE
- CWE-345
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.