diff --git a/CHANGELOG.md b/CHANGELOG.md
index 22ac248..aa97965 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 --- develop ---
 
+* security: Replace the confirmation pages' inline `onClick='cactiReturnTo()'` Cancel buttons with the CSP-safe `cactiReturnTo` class so the pages no longer trip Cacti's Content-Security-Policy script-src-attr directive; see the README for the one-time `applySkin()` snippet needed when running Cacti below 1.2.31 (1.2.31+ binds the class automatically)
+* security: Move the filter selects' inline onChange handlers into the ready block (and bind them via change, not click) so the page no longer trips Cacti's Content-Security-Policy script-src-attr directive
 * dev: Measure CI coverage with xdebug instead of pcov so the plugin's own sources are instrumented (pcov auto-scopes to the Composer root and skipped cacti/plugins/, leaving the patch-coverage gate with nothing to measure)
 * dev: Enforce patch coverage of changed lines in CI and remove the inert COMPOSER_ROOT_VERSION env from the Pest step
 * security: Add a version-safe CSP nonce (`plugin_tags_csp_nonce()`) to every inline `<script>` tag so pages stay compatible with Cacti's Content-Security-Policy nonce enforcement, while falling back cleanly on older Cacti releases that lack the `CactiSecureHeaders` class
diff --git a/README.md b/README.md
index 5e77dfe..d54d151 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,21 @@ Instead, they are summarised and only the most recent few are shown.
 It is also possible to archive old tags. These are then not displayed in the graph.
 
 
+## Cacti compatibility
+
+If you are running a version of Cacti below 1.2.31, please add the function
+below to the `applySkin()` function in `include/layout.js` to enable the Cancel
+buttons on forms to work:
+
+```js
+$(document).off('click.cactiReturnTo', '.cactiReturnTo')
+    .on('click.cactiReturnTo', '.cactiReturnTo', function(event) {
+        event.preventDefault();
+        cactiReturnTo($(this).attr('data-url'));
+    });
+```
+
+
 ## Installation
 
 To install the Tags plugin, simply copy the plugin_tags directory to
diff --git a/locales/po/cacti.pot b/locales/po/cacti.pot
index bf18b3a..e0517a6 100644
--- a/locales/po/cacti.pot
+++ b/locales/po/cacti.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Cacti \n"
 "Report-Msgid-Bugs-To: developers@cacti.net\n"
-"POT-Creation-Date: 2026-09-28 16:08-0400\n"
+"POT-Creation-Date: 2026-10-07 16:11-0400\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: Cacti Developers <developers@cacti.net>>\n"
 "Language-Team: Cacti Developers <developers@cacti.net>\n"
diff --git a/tags.php b/tags.php
index 46a6d21..9ef735a 100644
--- a/tags.php
+++ b/tags.php
@@ -174,7 +174,7 @@ function form_actions(): void {
 					</td>
 				</tr>";
 
-			$save_html = "<input type='button' value='" . __esc('Cancel') . "' onClick='cactiReturnTo()'>&nbsp;<input type='submit' value='" . __esc('Continue') . "' title='" . __esc_n('Delete item', 'Delete items', cacti_sizeof($items_array)) . "'>";
+			$save_html = "<input class='cactiReturnTo' type='button' value='" . __esc('Cancel') . "'>&nbsp;<input type='submit' value='" . __esc('Continue') . "' title='" . __esc_n('Delete item', 'Delete items', cacti_sizeof($items_array)) . "'>";
 		} elseif (get_filter_request_var('drp_action') == 2) { // disable
 			print "><tr>
 					<td class='topBoxAlt'>
@@ -183,7 +183,7 @@ function form_actions(): void {
 					</td>
 				</tr>";
 
-			$save_html = "<input type='button' value='" . __esc('Cancel') . "' onClick='cactiReturnTo()'>&nbsp;<input type='submit' value='" . __esc('Continue') . "' title='" . __esc_n('Disable item', 'Disable items', cacti_sizeof($items_array)) . "'>";
+			$save_html = "<input class='cactiReturnTo' type='button' value='" . __esc('Cancel') . "'>&nbsp;<input type='submit' value='" . __esc('Continue') . "' title='" . __esc_n('Disable item', 'Disable items', cacti_sizeof($items_array)) . "'>";
 		} elseif (get_filter_request_var('drp_action') == 3) { // enable
 			print "><tr>
 					<td class='topBoxAlt'>
@@ -192,7 +192,7 @@ function form_actions(): void {
 					</td>
 				</tr>";
 
-			$save_html = "<input type='button' value='" . __esc('Cancel') . "' onClick='cactiReturnTo()'>&nbsp;<input type='submit' value='" . __esc('Continue') . "' title='" . __esc_n('Enable item', 'Enable items', cacti_sizeof($items_array)) . "'>";
+			$save_html = "<input class='cactiReturnTo' type='button' value='" . __esc('Cancel') . "'>&nbsp;<input type='submit' value='" . __esc('Continue') . "' title='" . __esc_n('Enable item', 'Enable items', cacti_sizeof($items_array)) . "'>";
 		} elseif (get_filter_request_var('drp_action') == 4) { // archive
 			print "><tr>
 					<td class='topBoxAlt'>
@@ -201,7 +201,7 @@ function form_actions(): void {
 					</td>
 				</tr>";
 
-			$save_html = "<input type='button' value='" . __esc('Cancel') . "' onClick='cactiReturnTo()'>&nbsp;<input type='submit' value='" . __esc('Continue') . "' title='" . __esc_n('Archive item', 'Archive items', cacti_sizeof($items_array)) . "'>";
+			$save_html = "<input class='cactiReturnTo' type='button' value='" . __esc('Cancel') . "'>&nbsp;<input type='submit' value='" . __esc('Continue') . "' title='" . __esc_n('Archive item', 'Archive items', cacti_sizeof($items_array)) . "'>";
 		}
 	} else {
 		raise_message(40);
@@ -747,7 +747,7 @@ function tags_filter(): void {
 					<?php print __('Target', 'tags'); ?>
 					</td>
 					<td>
-						<select id='target' onChange='applyFilter()'>
+						<select id='target'>
 						<?php
 		print "<option value='-1'" . (get_request_var('rows') == -1 ? ' selected' : '') . '>' . __('Any', 'tags') . '</option>';
 
@@ -767,7 +767,7 @@ function tags_filter(): void {
 					<?php print __('Type', 'tags'); ?>
 					</td>
 					<td>
-						<select id='type' onChange='applyFilter()'>
+						<select id='type'>
 						<?php
 	print "<option value='-1'" . (get_request_var('rows') == -1 ? ' selected' : '') . '>' . __('Any', 'tags') . '</option>';
 
@@ -787,7 +787,7 @@ function tags_filter(): void {
 					<?php print __('Tags', 'tags'); ?>
 					</td>
 					<td>
-						<select id='rows' onChange='applyFilter()'>
+						<select id='rows'>
 						<?php
 	print "<option value='-1'" . (get_request_var('rows') == -1 ? ' selected' : '') . '>' . __('Default', 'tags') . '</option>';
 
@@ -926,15 +926,15 @@ function clearFilter() {
 		}
 
 		$(function() {
-			$('#rows').click(function() {
+			$('#rows').change(function() {
 				applyFilter();
 			});
 
-			$('#target').click(function() {
+			$('#target').change(function() {
 				applyFilter();
 			});
 
-			$('#type').click(function() {
+			$('#type').change(function() {
 				applyFilter();
 			});
 
diff --git a/tests/bin/patch-coverage.php b/tests/bin/patch-coverage.php
index e65b53d..f32de35 100644
--- a/tests/bin/patch-coverage.php
+++ b/tests/bin/patch-coverage.php
@@ -160,6 +160,9 @@ function changed_lines($base_ref) {
  * Empty by default; add entries per repository as the need arises.
  */
 $unmeasured_allowlist = [
+	// Web UI entry point: chdir + require of include/auth.php and dispatches on
+	// request vars, so it is not loaded into the isolated unit process.
+	'tags.php',
 ];
 $unmeasured            = array_values(array_diff(array_keys($changed), array_keys($measured)));
 $unexpected_unmeasured = array_values(array_diff($unmeasured, $unmeasured_allowlist));