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<title>[59712] trunk/src: Security: Enable the referrer policy header on the login screen.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/59712">59712</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/59712","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>johnbillion</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2025-01-27 14:39:18 +0000 (Mon, 27 Jan 2025)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Security: Enable the referrer policy header on the login screen.
This sets the same referrer policy of `strict-origin-when-cross-origin` that's used in the admin area to prevent a referrer being sent to other origins. This helps prevent unwanted exposure of potentially sensitive information that may be contained within the URL.
The header can be disabled if necessary by removing the `wp_admin_headers` action from the `login_init` hook.
Props kkmuffme, sagarlakhani, albatross10
Fixes <a href="https://core.trac.wordpress.org/ticket/62273">#62273</a>
See <a href="https://core.trac.wordpress.org/ticket/42036">#42036</a></pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminincludesadminfiltersphp">trunk/src/wp-admin/includes/admin-filters.php</a></li>
<li><a href="#trunksrcwpadminincludesmiscphp">trunk/src/wp-admin/includes/misc.php</a></li>
<li><a href="#trunksrcwpincludesdefaultfiltersphp">trunk/src/wp-includes/default-filters.php</a></li>
<li><a href="#trunksrcwpincludesfunctionsphp">trunk/src/wp-includes/functions.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpadminincludesadminfiltersphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/admin-filters.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/admin-filters.php 2025-01-26 22:20:20 UTC (rev 59711)
+++ trunk/src/wp-admin/includes/admin-filters.php 2025-01-27 14:39:18 UTC (rev 59712)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -44,7 +44,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> // Misc hooks.
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'admin_init', 'wp_admin_headers' );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-add_action( 'login_init', 'wp_admin_headers' );
</del><span class="cx" style="display: block; padding: 0 10px"> add_action( 'admin_init', 'send_frame_options_header', 10, 0 );
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'admin_head', 'wp_admin_canonical_url' );
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'admin_head', 'wp_site_icon' );
</span></span></pre></div>
<a id="trunksrcwpadminincludesmiscphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/misc.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/misc.php 2025-01-26 22:20:20 UTC (rev 59711)
+++ trunk/src/wp-admin/includes/misc.php 2025-01-27 14:39:18 UTC (rev 59712)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1416,29 +1416,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * Sends a referrer policy header so referrers are not sent externally from administration screens.
- *
- * @since 4.9.0
- */
-function wp_admin_headers() {
- $policy = 'strict-origin-when-cross-origin';
-
- /**
- * Filters the admin referrer policy header value.
- *
- * @since 4.9.0
- * @since 4.9.5 The default value was changed to 'strict-origin-when-cross-origin'.
- *
- * @link https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
- *
- * @param string $policy The admin referrer policy header value. Default 'strict-origin-when-cross-origin'.
- */
- $policy = apply_filters( 'admin_referrer_policy', $policy );
-
- header( sprintf( 'Referrer-Policy: %s', $policy ) );
-}
-
-/**
</del><span class="cx" style="display: block; padding: 0 10px"> * Outputs JS that reloads the page if the user navigated to it with the Back or Forward button.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * Used on the Edit Post and Add New Post screens. Needed to ensure the page is not loaded from browser cache,
</span></span></pre></div>
<a id="trunksrcwpincludesdefaultfiltersphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/default-filters.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/default-filters.php 2025-01-26 22:20:20 UTC (rev 59711)
+++ trunk/src/wp-includes/default-filters.php 2025-01-27 14:39:18 UTC (rev 59712)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -389,6 +389,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'login_head', 'wp_site_icon', 99 );
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'login_footer', 'wp_print_footer_scripts', 20 );
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'login_init', 'send_frame_options_header', 10, 0 );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+add_action( 'login_init', 'wp_admin_headers' );
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> // Feed generator tags.
</span><span class="cx" style="display: block; padding: 0 10px"> foreach ( array( 'rss2_head', 'commentsrss2_head', 'rss_head', 'rdf_header', 'atom_head', 'comments_atom_head', 'opml_head', 'app_head' ) as $action ) {
</span></span></pre></div>
<a id="trunksrcwpincludesfunctionsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/functions.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/functions.php 2025-01-26 22:20:20 UTC (rev 59711)
+++ trunk/src/wp-includes/functions.php 2025-01-27 14:39:18 UTC (rev 59712)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -7145,6 +7145,30 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Sends a referrer policy header so referrers are not sent externally from administration screens.
+ *
+ * @since 4.9.0
+ * @since 6.8.0 This function was moved from `wp-admin/includes/misc.php` to `wp-includes/functions.php`.
+ */
+function wp_admin_headers() {
+ $policy = 'strict-origin-when-cross-origin';
+
+ /**
+ * Filters the admin referrer policy header value.
+ *
+ * @since 4.9.0
+ * @since 4.9.5 The default value was changed to 'strict-origin-when-cross-origin'.
+ *
+ * @link https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
+ *
+ * @param string $policy The admin referrer policy header value. Default 'strict-origin-when-cross-origin'.
+ */
+ $policy = apply_filters( 'admin_referrer_policy', $policy );
+
+ header( sprintf( 'Referrer-Policy: %s', $policy ) );
+}
+
+/**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Retrieves a list of protocols to allow in HTML attributes.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 3.3.0
</span></span></pre>
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