CVE-2026-31824— Sylius has a Promotion Usage Limit Bypass via Race Condition

Sylius has a Promotion Usage Limit Bypass via Race Condition

Sylius is an Open Source eCommerce Framework on Symfony. A Time-of-Check To Time-of-Use (TOCTOU) race condition was discovered in the promotion usage limit enforcement. The same class of vulnerability affects the promotion usage limit (the global used counter on Promotion entities), coupon usage limit (the global used counter on PromotionCoupon entities), and coupon per-customer usage limit (the per-customer redemption count on PromotionCoupon entities). In all three cases, the eligibility check reads the used counter (or order count) from an in-memory Doctrine entity during validation, while the actual usage increment in OrderPromotionsUsageModifier happens later during order completion — with no database-level locking or atomic operations between the two phases. Because Doctrine flushes an absolute value (SET used = 1) rather than an atomic increment (SET used = used + 1), and because the affected entities lack optimistic locking, concurrent requests all read the same stale usage counts and pass the eligibility checks simultaneously. An attacker can exploit this by preparing multiple carts with the same limited-use promotion or coupon and firing simultaneous PATCH /api/v2/shop/orders/{token}/complete requests. All requests pass the usage limit checks and complete successfully, allowing a single-use promotion or coupon to be redeemed an arbitrary number of times. The per-customer limit can be bypassed in the same way by a single customer completing multiple orders concurrently. No authentication is required to exploit this vulnerability. This may lead to direct financial loss through unlimited redemption of limited-use promotions and discount coupons. The issue is fixed in versions: 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 and above.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

使用共享资源的并发执行不恰当同步问题(竞争条件)

Sylius 安全漏洞

Sylius是波兰Sylius公司的一套基于Symfony框架的开源电子商务平台。 Sylius存在安全漏洞，该漏洞源于促销使用限制强制执行中存在检查时间到使用时间竞争条件，可能导致绕过使用限制。以下版本受到影响：1.9.12之前版本、1.10.16之前版本、1.11.17之前版本、1.12.23之前版本、1.13.15之前版本、1.14.18之前版本、2.0.16之前版本、2.1.12之前版本和2.2.3之前版本。

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