CVE-2021-23447: Cross-site Scripting (XSS)

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-10-07 · updated 2026-06-17
Weakness: CWE-843

Description

This affects the package teddy before 0.5.9. A type confusion vulnerability can be used to bypass input sanitization when the model content is an array (instead of a string).

Affected products

teddy: before 0.5.9 — fixed in 0.5.9

How to fix

Upgrade to a fixed version: teddy 0.5.9. Check the vendor advisory for mitigations.

References

https://github.com/rooseveltframework/teddy/pull/518
https://github.com/rooseveltframework/teddy/releases/tag/0.5.9
https://snyk.io/vuln/SNYK-JS-TEDDY-1579557
https://github.com/rooseveltframework/teddy/pull/518
https://github.com/rooseveltframework/teddy/releases/tag/0.5.9
https://snyk.io/vuln/SNYK-JS-TEDDY-1579557

Get alerted when CVE-2021-23447 or the next vulnerability affects your stack