Vulnerability in Sylius
CVE-2026-100872
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.
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/Sylius/Sylius (product)
- github.com/Sylius/Sylius/commit/9e9aeaacbc97b1fc01d573e44d6679194527905d (patch)
- github.com/Sylius/Sylius/pull/19216 (issue-tracking, patch)
- github.com/Sylius/Sylius/releases/tag/v2.2.9 (release-notes)
- github.com/Sylius/Sylius/security/advisories/GHSA-vv4h-q2x8-74g4 (vendor-advisory)
- www.vulncheck.com/advisories/sylius-2-x-before-2.1.16-and-2.2.9-payment-amount-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100872?
- CVE-2026-100872 is a high-severity vulnerability in Sylius, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2026-09-27.
- How severe is CVE-2026-100872?
- High severity. CVSS v3 base score is 7.5 out of 10.