High severity8.1NVD Advisory· Published Feb 11, 2026· Updated Apr 15, 2026
CVE-2025-69871
CVE-2025-69871
Description
A race condition vulnerability exists in MedusaJS Medusa v2.12.2 and earlier in the registerUsage() function of the promotion module. The function performs a non-atomic read-check-update operation when enforcing promotion usage limits. This allows unauthenticated remote attackers to bypass usage limits by sending concurrent checkout requests, resulting in unlimited redemptions of limited-use promotional codes and potential financial loss.
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Affected products
2Patches
Vulnerability mechanics
References
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