Executive Summary

CVE-2025-15242 is a race condition vulnerability in PHPEMS version 11.0 and earlier, specifically in the coupon recharge function. The system fails to enforce atomicity checks on coupon usage and inventory, allowing an attacker to send multiple concurrent requests using the same valid coupon code. This enables repeated recharge of the same coupon across multiple user accounts simultaneously, exploiting a timing window where shared resources are accessed without proper exclusive control. [1, 2, 3]

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Impact Analysis

This vulnerability can lead to unauthorized accumulation of virtual assets or financial losses if the coupons are linked to real currency. Attackers can exploit the flaw to recharge multiple accounts using the same coupon code, resulting in improper transaction handling and potential integrity violations in the system's coupon management. [1, 3]

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Detection Guidance

This vulnerability can be detected by monitoring for multiple concurrent requests using the same valid coupon code targeting the coupon recharge function. Detection involves observing unusual patterns of coupon usage where multiple user accounts are credited simultaneously with the same coupon, but only one redemption record is logged. A practical approach is to analyze web server logs or application logs for concurrent POST requests to the coupon recharge endpoint with identical coupon codes. Additionally, running scripts similar to the proof-of-concept exploit that simulate concurrent coupon recharge requests can help verify the presence of the race condition. Specific commands would depend on your environment, but for example, using tools like curl or custom scripts to send concurrent requests with the same coupon code and monitoring the backend redemption records can reveal the issue. [1, 3]

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Mitigation Strategies

Immediate mitigation steps include implementing database row-level locking during coupon recharge operations to ensure atomicity, enforcing real-time validation of coupon usage status to prevent multiple redemptions, and restricting the frequency of recharge requests to prevent concurrent exploitation. Since no known countermeasures or patches are currently available, replacing the affected component with an alternative product is also suggested. Monitoring and limiting concurrent requests to the coupon recharge function can reduce the risk of exploitation until a permanent fix is applied. [2, 3]

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