CVE-2026-128042
OpenMage magento-lts before 20.19.0 Race Condition in Coupon Usage Limits
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
OpenMage magento-lts before 20.19.0 and 21.0.0-beta1 before 21.0.0-beta3 contains a race condition in shopping cart price rule usage limits, because Mage_SalesRule_Model_Validator checks coupon limits without locking and the usage counters are later incremented non-atomically. Unauthenticated attackers, including guest shoppers, can submit concurrent checkouts to redeem a limited coupon more times than its cap allows.
| CWE | CWE-362 |
| Vendor | openmage |
| Product | magento-lts |
| Published | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
OpenMage / magento-lts
0 < 20.19.0
OpenMage / magento-lts
21.0.0-beta1 < 21.0.0-beta3
References
github.com: https://github.com/OpenMage/magento-lts/security/advisories/GHSA-5rg7-22cv-c9q6 github.com: https://github.com/OpenMage/magento-lts/commit/2626f027a752cda004c5cf7f8f9bd3cf52f525f2 vulncheck.com: https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.19.0-race-condition-in-coupon-usage-limits
Credits
🔍 skeletonsec colinmollenhour