CVE-2021-38751 Scanner.
ExponentCMS <= 2.6 - Host Header Injection
Free and read-only. Scan only sites you own or are allowed to test.
What This Check Does.
Read-only
It only asks your site for public pages, the way a browser would. Nothing is changed, uploaded or stored.
Up to 1 request
A small, fixed number of requests, so the check is quick and will not load your site.
Looks for CVE-2021-38751
It looks for the specific sign of this one vulnerability and ends with a clear answer: vulnerable, not vulnerable, or could not be determined.
About CVE-2021-38751. What It Means.
An HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponent_constants.php. A modified HTTP header can change links on the webpage to an arbitrary value,leading to a possible attack vector for MITM.
FAQ
Common Questions.
ExponentCMS <= 2.6 - Host Header Injection. An HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponent_constants.php. A modified HTTP header can change links on the webpage to an arbitrary value,leading to a possible attack vector for MITM.
Atlas sends up to 1 read-only request to your site and looks for the specific sign of CVE-2021-38751 in ExponentCMS. Nothing is changed, uploaded or stored on your site.
CVE-2021-38751 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing. Its CVSS score is 4.3.
Yes. The check only reads public pages, the same way a browser or a search engine would. Scan only sites you own or are allowed to test.
It means no sign of CVE-2021-38751 was found by this read-only check. It does not prove the site is free of other weaknesses.
Update ExponentCMS to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. The vendor links and details are in the CVE-2021-38751 briefing linked on this page.
Scan only sites you own or have written permission to test. A result of Not Vulnerable means this read-only check found no sign of CVE-2021-38751; it is not a guarantee that the site is secure.