Prototype pollution in fast-xml-parser - CVE-2023-26920

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Main Vulnerability Database Vulnerabilities #VU80772

Prototype pollution in fast-xml-parser - CVE-2023-26920

Published: September 14, 2023 / Updated: April 20, 2026


Vulnerability identifier: #VU80772
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2023-26920
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
fast-xml-parser
Software vendor:
Natural Intelligence

Description

The vulnerability allows a remote attacker to execute arbitrary JavaScript code.

The vulnerability exists due to improper input validation. A remote attacker can pass specially crafted input to the application and perform prototype pollution, which can result in information disclosure or data manipulation.


Remediation

Install updates from vendor's website.

External links