diff --git a/phpBB/adm/style/acp_icons.html b/phpBB/adm/style/acp_icons.html
index 45fe7f8ebc..25d5cb5207 100644
--- a/phpBB/adm/style/acp_icons.html
+++ b/phpBB/adm/style/acp_icons.html
@@ -105,7 +105,7 @@
 	<!-- BEGIN items -->
 		<tr>
 
-		<td style="text-align: center;"><img src="{items.IMG_SRC}" alt="{items.TEXT_ALT}" title="{items.TEXT_ALT}" /><input type="hidden" name="image[{items.IMG}]" value="1" /></td>
+		<td style="text-align: center;"><img src="{items.IMG_SRC}" alt="{items.TEXT_ALT}" title="{items.TEXT_ALT}" style="max-width: 160px;"><input type="hidden" name="image[{items.IMG}]" value="1" /></td>
 		<td style="vertical-align: top;">[{items.IMG}]</td>
 		<!-- IF S_SMILIES -->
 			<td><input class="text post" type="text" name="code[{items.IMG}]" value="{items.CODE}" size="10" maxlength="50" /></td>
diff --git a/phpBB/adm/style/acp_ranks.html b/phpBB/adm/style/acp_ranks.html
index d373657114..aac5de6fe7 100644
--- a/phpBB/adm/style/acp_ranks.html
+++ b/phpBB/adm/style/acp_ranks.html
@@ -85,7 +85,7 @@
 	<!-- BEGIN ranks -->
 	<tr>
 		<!-- EVENT acp_ranks_list_column_before -->
-		<td style="text-align: center;"><!-- IF ranks.S_RANK_IMAGE --><img src="{ranks.RANK_IMAGE}" alt="{ranks.RANK_TITLE}" title="{ranks.RANK_TITLE}" /><!-- ELSE -->&nbsp; - &nbsp;<!-- ENDIF --></td>
+		<td style="text-align: center;"><!-- IF ranks.S_RANK_IMAGE --><img src="{ranks.RANK_IMAGE}" alt="{ranks.RANK_TITLE}" title="{ranks.RANK_TITLE}" style="max-width: 160px;"><!-- ELSE -->&nbsp; - &nbsp;<!-- ENDIF --></td>
 		<td style="text-align: center;">{ranks.RANK_TITLE}</td>
 		<td style="text-align: center;"><!-- IF ranks.S_SPECIAL_RANK -->&nbsp; - &nbsp;<!-- ELSE -->{ranks.MIN_POSTS}<!-- ENDIF --></td>
 		<!-- EVENT acp_ranks_list_column_after -->
diff --git a/phpBB/includes/acp/acp_icons.php b/phpBB/includes/acp/acp_icons.php
index 6429424983..4758e89a93 100644
--- a/phpBB/includes/acp/acp_icons.php
+++ b/phpBB/includes/acp/acp_icons.php
@@ -91,29 +91,43 @@ class acp_icons
 				{
 					$img_size = getimagesize($phpbb_root_path . $img_path . '/' . $path . $img);
 
-					if (!$img_size[0] || !$img_size[1] || strlen($img) > 255)
+					if ($img_size)
 					{
-						continue;
-					}
+						if (!$img_size[0] || !$img_size[1] || strlen($img) > 255)
+						{
+							continue;
+						}
 
-					// adjust the width and height to be lower than 128px while perserving the aspect ratio (for icons)
-					if ($mode == 'icons')
+						// adjust the width and height to be lower than 128px while perserving the aspect ratio (for icons)
+						if ($mode == 'icons')
+						{
+							if ($img_size[0] > 127 && $img_size[0] > $img_size[1])
+							{
+								$img_size[1] = (int) ($img_size[1] * (127 / $img_size[0]));
+								$img_size[0] = 127;
+							}
+							else if ($img_size[1] > 127)
+							{
+								$img_size[0] = (int) ($img_size[0] * (127 / $img_size[1]));
+								$img_size[1] = 127;
+							}
+						}
+					}
+					else
 					{
-						if ($img_size[0] > 127 && $img_size[0] > $img_size[1])
-						{
-							$img_size[1] = (int) ($img_size[1] * (127 / $img_size[0]));
-							$img_size[0] = 127;
-						}
-						else if ($img_size[1] > 127)
-						{
-							$img_size[0] = (int) ($img_size[0] * (127 / $img_size[1]));
-							$img_size[1] = 127;
-						}
+						// getimagesize can't read the dimensions of the SVG files
+						// https://bugs.php.net/bug.php?id=71517
+						$xml_get = simplexml_load_file($phpbb_root_path . $img_path . '/' . $path . $img);
+
+						$svg_width = intval($xml_get['width']);
+						$svg_height = intval($xml_get['height']);
 					}
 
 					$_images[$path . $img]['file'] = $path . $img;
-					$_images[$path . $img]['width'] = $img_size[0];
-					$_images[$path . $img]['height'] = $img_size[1];
+
+					// Give SVG a fallback on failure
+					$_images[$path . $img]['width'] = $img_size ? $img_size[0] : ($svg_width ?: 32);
+					$_images[$path . $img]['height'] = $img_size ? $img_size[1] : ($svg_height ?: 32);
 				}
 			}
 			unset($imglist);
diff --git a/phpBB/includes/acp/acp_ranks.php b/phpBB/includes/acp/acp_ranks.php
index 47e4e85aa1..c904e0cdf5 100644
--- a/phpBB/includes/acp/acp_ranks.php
+++ b/phpBB/includes/acp/acp_ranks.php
@@ -55,8 +55,8 @@ class acp_ranks
 				$min_posts = ($special_rank) ? 0 : max(0, $request->variable('min_posts', 0));
 				$rank_image = $request->variable('rank_image', '');
 
-				// The rank image has to be a jpg, gif or png
-				if ($rank_image != '' && !preg_match('#(\.gif|\.png|\.jpg|\.jpeg)$#i', $rank_image))
+				// The rank image has to be a jp(e)g, gif, png, svg or webp
+				if ($rank_image != '' && !preg_match('#(\.gif|\.png|\.jpg|\.jpeg|\.svg|\.webp)$#i', $rank_image))
 				{
 					$rank_image = '';
 				}
diff --git a/phpBB/includes/functions_admin.php b/phpBB/includes/functions_admin.php
index 5f7089161b..fa4dac7e57 100644
--- a/phpBB/includes/functions_admin.php
+++ b/phpBB/includes/functions_admin.php
@@ -479,7 +479,7 @@ function copy_forum_permissions($src_forum_id, $dest_forum_ids, $clear_dest_perm
 /**
 * Get physical file listing
 */
-function filelist($rootdir, $dir = '', $type = 'gif|jpg|jpeg|png')
+function filelist($rootdir, $dir = '', $type = 'gif|jpg|jpeg|png|svg|webp')
 {
 	$matches = array($dir => array());
 
diff --git a/phpBB/styles/prosilver/theme/content.css b/phpBB/styles/prosilver/theme/content.css
index d945a14bd6..fa8f952cab 100644
--- a/phpBB/styles/prosilver/theme/content.css
+++ b/phpBB/styles/prosilver/theme/content.css
@@ -795,6 +795,10 @@ fieldset.polls dd div {
 	margin-bottom: 10px;
 }
 
+.profile-rank img {
+	max-width: 160px;
+}
+
 /* Post-profile avatars */
 .postprofile .has-avatar .avatar-container {
 	overflow: hidden;