# CVE-2021-3785: Cross-site Scripting in yourls

Source: https://junglewise.ai/threats/cve-2021-3785-cross-site-scripting-in-yourls  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-09-20  
License: CC BY 4.0 with a link back

CVE-2021-3785 · Severity: low · CVSS 3.1 · Published 2021-09-20

Cross-site Scripting in yourls

Technologies: [yourls/yourls (Packagist)](https://junglewise.ai/threats/technologies/yourls-yourls). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2021-3785 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2021-3785 being exploited in the wild.

**How severe is CVE-2021-3785?** Low severity, with a CVSS score of 3.1, published 20 September 2021.

**Which products and versions are affected?** yourls/yourls (Packagist) ECOSYSTEM:introduced=0,fixed=1.8.2.

**Is there a fix for CVE-2021-3785?** Yes. yourls/yourls (Packagist): upgrade to 1.8.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2021-3785?** Check whether you run yourls/yourls (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- yourls/yourls (Packagist): upgrade to 1.8.2 or later

  ```sh
  composer require yourls/yourls:^1.8.2
  ```


## Affected products

- yourls/yourls (Packagist) ECOSYSTEM:introduced=0,fixed=1.8.2

## Identifiers

- CVE-2021-3785
- GHSA-m9fq-c9hp-59g7

## Related threats

- [YOURLS unauthenticated path traversal file inclusion](https://junglewise.ai/threats/cve-2026-62858-yourls-unauthenticated-file-inclusion)
- [YOURLS stored XSS in referrer statistics via crafted Referer header](https://junglewise.ai/threats/cve-2026-63135-yourls-stored-xss-in-referrer-statistics-via-crafted-referer)
- [YOURLS is vulnerable to XSS through JSONP and Callback request parameters](https://junglewise.ai/threats/yourls-is-vulnerable-to-xss-through-jsonp-and-callback-request-d2d8fa38)
- [YOURLS Stored Cross Site Scripting (XSS)](https://junglewise.ai/threats/cve-2020-27388-yourls-stored-cross-site-scripting-xss)
- [Cross-Site Request Forgery in YOURLS](https://junglewise.ai/threats/cve-2022-0088-cross-site-request-forgery-in-yourls)