6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
0.967 High
EPSS
Percentile
99.7%
The contributed HSTS module makes it easy for site administrators to implement HTTP Strict Transport Security (HSTS) by setting the Strict-Transport-Security header on each page generated by Drupal.
HSTS module provides a configuration UI for the HSTS “include subdomains” directive, which indicates that the browser should apply the HSTS policy to all subdomains on the site’s domain.
HSTS module did not implement the “include subdomains” directive correctly (it is misspelled as include_subdomains rather than includeSubDomains). As a result, the HSTS policy was not applied to subdomains as site administrators had expected.
This vulnerability is mitigated by the fact that only subdomains where HSTS was expected to be enabled are affected and an attacker would still need to execute a man-in-the-middle attack to exploit the issue.
Drupal core is not affected. If you do not use the contributed HTTP Strict Transport Security module, there is nothing you need to do.
Install the latest version:
Also see the HTTP Strict Transport Security project page.