CVE-2021-23443: Cross-site Scripting (XSS)

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-09-21 · updated 2026-06-17
Weakness: CWE-843

Description

This affects the package edge.js before 5.3.2. A type confusion vulnerability can be used to bypass input sanitization when the input to be rendered is an array (instead of a string or a SafeValue), even if {{ }} are used.

Affected products

edge.js: before 5.3.2 — fixed in 5.3.2

How to fix

Upgrade to a fixed version: edge.js 5.3.2. Check the vendor advisory for mitigations.

References

https://github.com/edge-js/edge/commit/fa2c7fde86327aeae232752e89a6e37e2e469e21
https://snyk.io/vuln/SNYK-JS-EDGEJS-1579556
https://github.com/edge-js/edge/commit/fa2c7fde86327aeae232752e89a6e37e2e469e21
https://snyk.io/vuln/SNYK-JS-EDGEJS-1579556

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