[SECURITY] Avoid HTML injection in password recovery mail

The `receiverName` variable used in the password recovery mail of the
Extbase felogin plugin was susceptible to HTML injection due to
missing sanitization. The variable is now passed thru the
`f:format.htmlspecialchars` ViewHelper.

Resolves: #96559
Releases: main, 11.5, 10.4
Change-Id: I60e23c161f7f2fcc87b8870345b10a4c31d7b8db
Security-Bulletin: TYPO3-CORE-SA-2022-004
Security-References: CVE-2022-31049
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74900


Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>

typo3/sysext/felogin/Resources/Private/Email/Templates/PasswordRecovery.html

@@ -9,7 +9,7 @@
         {f:translate(
         key: 'forgot_validate_reset_password_html',
         extensionName: 'felogin',
-        arguments: '{ 0: receiverName, 1: recoveryLink, 2: validUntil }'
+        arguments: '{ 0: "{receiverName -> f:format.htmlspecialchars()}", 1: recoveryLink, 2: validUntil }'
         ) -> f:format.html()}
     </f:spaceless>
 </f:section>