CVE-2026-128042
Published:November 13, 2026
Updated:November 13, 2026
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.
Affected Packages
https://github.com/OpenMage/magento-lts.git (GITHUB):
Affected version(s) >=1.1.1 <v20.19.0 || >=v19.4.0 <v20.19.0 || >=v20.0.0 <v20.19.0Fix Suggestion:
Update to version v20.19.0https://github.com/OpenMage/magento-lts.git (GITHUB):
Affected version(s) >=v21.0.0-beta1 <v21.0.0-beta3Fix Suggestion:
Update to version v21.0.0-beta3openmage/magento-lts (PHP):
Affected version(s) >=v21.0.0-beta1 <v21.0.0-beta3Fix Suggestion:
Update to version v21.0.0-beta3openmage/magento-lts (PHP):
Affected version(s) >=1.9.1.1 <v20.19.0 || >=v19.4.0 <v20.19.0 || >=v20.0.0 <v20.19.0Fix Suggestion:
Update to version v20.19.0Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Concurrent Execution using Shared Resource with Improper Synchronization
EPSS
Base Score:
0.28