XSS in client rendered block templates in rendr

Description

Affected versions of rendr are vulnerable to cross-site scripting when client side rendering is done inside a _block.

Server side rendering is not affected and is properly escaped.

Recommendation

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

• Affected version(s): <= 1.1.3
• Patched version(s): 1.1.4

References

• GHSA-v5hp-35hw-cw5x
• www.npmjs.com
• CVE-2016-1000230
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Stored XSS via <iframe> in HAX CMS allows access to sensitive client-side data and account takeover - CVE-2026-46396
• Stored XSS via <iframe> in HAX CMS allows access to sensitive client-side data and account takeover - @haxtheweb/video-player - CVE-2026-46396
• Cross-Site Scripting (XSS) in pivottable - CVE-2016-1000241
• locize Client SDK: Cross-origin DOM XSS & Handler Hijack Through Missing e.origin Validation in InContext Editor - CVE-2026-41886

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Tags:

npm

rendr