CVE-2026-116215
Received Received - Intake

Race Condition in MacCMS Allows Multiple Card Redemptions

Publication date: 2026-10-26

Last updated on: 2026-10-26

Assigner: VulnCheck

Description
MacCMS v10 through 2026.1000.4056 contains a race condition vulnerability in Card::useData() that allows authenticated members to redeem one recharge card multiple times via the user/buy endpoint. Attackers can send many concurrent flag=card requests that pass the non-locking card read before it is marked used, inflating user_points to buy VIP upgrades and paid content.

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Meta Information

Published
2026-10-26
Last Modified
2026-10-26
Generated
2026-10-26
AI Q&A
2026-10-26
EPSS Evaluated
N/A
NVD
CVE-2026-116215
EUVD
EUVD-2026-109807

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
maccmspro maccms10 0
magicblack maccms10 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

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Executive Summary

MacCMS v10 through 2026.1000.4056 has a race condition in Card::useData() that allows authenticated users to exploit the user/buy endpoint. By sending multiple concurrent requests with flag=card, attackers can redeem a single recharge card multiple times before the system marks it as used. This inflates user_points, enabling unauthorized purchases like VIP upgrades or paid content.

Detection Guidance

Detecting this race condition vulnerability requires monitoring for multiple concurrent requests to the user/buy endpoint with flag=card parameters. Check server logs for repeated card redemption attempts from the same user or IP within a short timeframe. Look for non-locking card read operations that fail to update the card status properly.

Impact Analysis

If you are a user of MacCMS, an attacker could exploit this to fraudulently increase their account balance or access premium features without payment. For administrators, this could lead to financial losses from unauthorized VIP upgrades or content access, as well as reputational damage due to compromised user accounts.

Mitigation Strategies

Immediately patch MacCMS to the latest version. Implement database-level locking for card redemption operations to prevent race conditions. Add rate limiting to the user/buy endpoint to block excessive concurrent requests. Review user_points values for suspicious inflations and revert unauthorized VIP upgrades or paid content purchases.

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