CVE-2023-3965: nsc <= 1.0 - Prototype Pollution to Reflected Cross-Site Scripting

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-20 · updated 2026-06-17
Weakness: CWE-79

Description

The nsc theme for WordPress is vulnerable to Reflected Cross-Site Scripting via prototype pollution in versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Affected products

National Show Centre NSC WordPress Theme: through 1.0

References

https://github.com/BlackFan/client-side-prototype-pollution
https://www.wordfence.com/threat-intel/vulnerabilities/id/5909513d-8877-40ff-bee9-d565141b7ed2?source=cve
https://github.com/BlackFan/client-side-prototype-pollution
https://www.wordfence.com/threat-intel/vulnerabilities/id/5909513d-8877-40ff-bee9-d565141b7ed2?source=cve

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