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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-31824)

ID	Name	Product	Family	Type	Severity
438633	SCA: security update for sylius/sylius (GHSA-7mp4-25j8-hp5q)	Tenable Cloud Security	SCA Checks	Local	medium
438633	SCA: security update for sylius/sylius (GHSA-7mp4-25j8-hp5q)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-31824

medium

Tenable Plugins

medium

medium