Time-of-check Time-of-use (TOCTOU) Race Condition Affecting sylius/sylius package, versions <1.9.12>=1.10.0-alpha.1, <1.10.16>=1.11.0-alpha.1, <1.11.17>=1.12.0-alpha.1, <1.12.23>=1.13.0-alpha.1, <1.13.15>=1.14.0-alpha.1, <1.14.18>=2.0.0-alpha.1, <2.0.16>=2.1.0, <2.1.12>=2.2.0, <2.2.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-SYLIUSSYLIUS-15460798
- published11 Mar 2026
- disclosed11 Mar 2026
- creditwhiteov3rflow, Bartlomiej Nowinski
Introduced: 11 Mar 2026
CVE-2026-31824 (opens in a new tab)How to fix?
Upgrade sylius/sylius to version 1.9.12, 1.10.16, 1.11.17, 1.12.23, 1.13.15, 1.14.18, 2.0.16, 2.1.12, 2.2.3 or higher.
Overview
sylius/sylius is a platform for PHP, based on Symfony framework.
Affected versions of this package are vulnerable to Time-of-check Time-of-use (TOCTOU) Race Condition through a race condition in the promotion and coupon usage limit enforcement process. An attacker can redeem limited-use promotions or coupons multiple times by sending concurrent requests that bypass usage restrictions. No authentication is required to exploit this issue, which may result in financial loss due to unlimited redemption of discounts.
Workaround
This vulnerability can be mitigated by decorating the OrderPromotionsUsageModifier service to use atomic operations based on actual database-synchronized values, as described in the advisory.