Medium severity · published May 29, 2026
CVE-2026-47741
Shopper: Race condition on Discount.usage_limit allows silent over-redemption
5.9
CVSS
0.2%
EPSS
No
On KEV
Description
Shopper is a Headless e-commerce Admin Panel. Prior to 2.8.0, CreateOrderFromCartAction::execute previously created the Order row before checking and incrementing the discount's total_use counter. Under concurrent checkout pressure (Black Friday, flash sale, viral coupon), the global usage_limit was silently exceeded: orders were committed with the discount fully applied to price_amount while the counter blocked at usage_limit. The merchant had no signal that an over-redemption had occurred. This vulnerability is fixed in 2.8.0.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SH
shopper · shopperlabs
< 2.8.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47741
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47741
github.com
https://github.com/shopperlabs/shopper/issues/510
github.com
https://github.com/shopperlabs/shopper/pull/511
github.com
https://github.com/shopperlabs/shopper/security/advisories/GHSA-9rh9-hf3w-9fgg
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