Silverstripe Forms allow malicious HTML or JavaScript to be inserted
through non-scalar FormField attributes, which allows performing XSS (Cross-Site Scripting)
on some forms built with user input (Request data). This can lead to phishing attempts
to obtain a user's credentials or other sensitive user input.
There is no known attack vector for extracting user-session information or credentials automatically,
it required a user to fall for the phishing attempt.
XSS can also be used to modify the presentation of content in malicious ways.
As of SS4.0.0 and the introduction of TrustedProxyMiddleware, the default now if no trusted proxies are defined is that nothing is a trusted proxy, whereas in SS3 a missing declaration was treated as everything being allowed.
Following the example will give the following error;
```[Emergency] Uncaught Error: Class {my namespace}\Permission not found```
Added the missing class
- Stronger wording around "use composer"
- Consistent domain and email address naming
- Removed example for publishing non-composer modules (those shouldn't be encouraged)
- Removed instructions for installing modules from archives
[ci skip]
API: SS_TRUSTED_PROXY_HOST_HEADER replace with middleware config
API: SS_TRUSTED_PROXY_PROTOCOL_HEADER replace with middleware config
API: SS_TRUSTED_PROXY_IP_HEADER replace with middleware config
API: Front-End-Https = “on” header no longer supported
This middleware replaces the TRUSTED_PROXY setting and shifts its
configuration out of the env vars and bootstrap and into the Director
flow.
Repairing tests and regressions
Consistently use `Security::getCurrentUser()` and `Security::setCurrentUser()`
Fix for the logout handler to properly logout, some minor wording updates
Remove the login hashes for the member when logging out.
BasicAuth to use `HTTPRequest`
- Amending best practices for secure coding to enforce HTTPS
- Add security headers to enforce HTTPS
- Ensure secure cookies are used.
- Added links for testing, changed documentation as part of peer review.
- Arrange headers to work with HTTP interface.
- fixed Cache-Control case
- Added reference to Secure Sessions.
- Replaced Cardinality with unique
- Fixed innacurate reference to decendant.
- Consistent spelling
- Databases over DBMSs
Also created a contributing/coding_conventions landing page separately from the PHP ones, since we now need to account for JS and CSS conventions as well
