Nunjucks autoescape bypass leads to cross site scripting

Description

In Nunjucks versions prior to version 3.2.4, it was possible to bypass the restrictions which are provided by the autoescape functionality. If there are two user-controlled parameters on the same line used in the views, it was possible to inject cross site scripting payloads using the backslash \ character.

Recommendation

Update the nunjucks package to the latest compatible version. Followings are version details:

• Affected version(s): < 3.2.4
• Patched version(s): 3.2.4

References

• GHSA-x77j-w7wf-fjmw
• bugzilla.mozilla.org
• CVE-2023-2142
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• cors-anywhere vulnerable to server-side request forgery - CVE-2020-36851
• Valid ECDSA signatures erroneously rejected in Elliptic - CVE-2024-48948
• Trix vulnerable to Cross-site Scripting on copy & paste - CVE-2025-46812
• Froala WYSIWYG editor allows cross-site scripting (XSS) - CVE-2024-51434

Tags:

npm

nunjucks