diff --git a/api.wordpress.org/public_html/dotorg/slack/community-deputies-calendly-webhook.php b/api.wordpress.org/public_html/dotorg/slack/community-deputies-calendly-webhook.php
index cb4a7b7e38..e90dacf17e 100644
--- a/api.wordpress.org/public_html/dotorg/slack/community-deputies-calendly-webhook.php
+++ b/api.wordpress.org/public_html/dotorg/slack/community-deputies-calendly-webhook.php
@@ -49,7 +49,7 @@ function api_request( $url ) {
 }
 
 // Check the request is valid.
-if ( empty( $_GET['secret'] ) || ! hash_equals( COMMUNITY_CALENDLY_SECRET, $_GET['secret'] ) ) {
+if ( empty( $_GET['secret'] ) || ! is_string( $_GET['secret'] ) || ! hash_equals( COMMUNITY_CALENDLY_SECRET, wp_unslash( $_GET['secret'] ) ) ) {
 	header( 'HTTP/1.1 403 Forbidden' );
 	die( 'Invalid secret provided.' );
 }
diff --git a/api.wordpress.org/public_html/dotorg/slack/security-team.php b/api.wordpress.org/public_html/dotorg/slack/security-team.php
index 65ce43cf57..c71b5d4f81 100644
--- a/api.wordpress.org/public_html/dotorg/slack/security-team.php
+++ b/api.wordpress.org/public_html/dotorg/slack/security-team.php
@@ -1,4 +1,18 @@
 <?php
+/**
+ * Reports the security team's user logins to the Trac server.
+ *
+ * Standalone endpoint: WordPress is not loaded, so request data is never slashed, and
+ * Trac authenticates itself with the shared `API_TOKEN` secret; nonces do not exist in
+ * server-to-server requests. The file body sits inside a curly-brace namespace without
+ * the matching indent, so the scope sniff reads every line as one level short.
+ *
+ * phpcs:disable Generic.WhiteSpace.ScopeIndent
+ * phpcs:disable WordPress.Security.NonceVerification
+ * phpcs:disable WordPress.Security.ValidatedSanitizedInput.MissingUnslash
+ *
+ * @package WordPressdotorg\API\Slack
+ */
 
 namespace {
 	if ( ! isset( $GLOBALS['wpdb'] ) ) {
@@ -61,8 +75,13 @@ function get_security_team( $user_field = 'user_login' ) {
 function api_call() {
 	header( 'Content-type: text/plain' );
 
+	// Trac sends the token as a query arg; anything else is not a valid request.
+	if ( ! isset( $_GET['token'] ) || ! is_string( $_GET['token'] ) || '' === $_GET['token'] ) {
+		exit;
+	}
+
 	// Confirm it came from the Trac server.
-	if ( ! hash_equals( API_TOKEN, $_GET['token'] ?? '' ) ) {
+	if ( ! hash_equals( API_TOKEN, $_GET['token'] ) ) {
 		exit;
 	}
 
diff --git a/api.wordpress.org/public_html/dotorg/slack/trac-bot.php b/api.wordpress.org/public_html/dotorg/slack/trac-bot.php
index 7eb0cd19db..de04f64afc 100644
--- a/api.wordpress.org/public_html/dotorg/slack/trac-bot.php
+++ b/api.wordpress.org/public_html/dotorg/slack/trac-bot.php
@@ -10,8 +10,13 @@
 
 namespace Dotorg\Slack\Trac {
 
+	// Slack sends the token as a query arg; anything else is not a webhook request.
+	if ( ! isset( $_GET['token'] ) || ! is_string( $_GET['token'] ) || '' === $_GET['token'] ) {
+		return;
+	}
+
 	// Verify it came from Slack.
-	if ( ! hash_equals( URL_SECRET__TRAC_BOT, $_GET['token'] ?? '' ) ) {
+	if ( ! hash_equals( URL_SECRET__TRAC_BOT, wp_unslash( $_GET['token'] ) ) ) {
 		return;
 	}