diff --git a/.circleci/template.yml b/.circleci/template.yml
index e9f0501b7bb..46d57cd1cb2 100644
--- a/.circleci/template.yml
+++ b/.circleci/template.yml
@@ -148,6 +148,11 @@ jobs:
           when: always
           name: Check if all packages are exported in the "ckeditor5" package
           command: yarn run check-exports
+      - run:
+          when: always
+          name: Check if all editor icon SVGs are properly defined
+          working_directory: external/ckeditor5-commercial
+          command: yarn run validate-svg-icons
 
   cke5_coverage:
     machine: true
diff --git a/package.json b/package.json
index c9f6b77531e..0e7fceb6466 100644
--- a/package.json
+++ b/package.json
@@ -212,6 +212,7 @@
     "release:clean": "node ./scripts/release/clean.mjs",
     "clean-up-svg-icons": "node ./scripts/clean-up-svg-icons.mjs",
     "collect-svg-icons": "node scripts/collect-svg-icons.mjs",
+    "validate-svg-icons": "node scripts/ci/validate-svg-icons.mjs",
     "check-dependencies": "ckeditor5-dev-dependency-checker",
     "check-dependencies:versions-match": "node ./scripts/ci/check-dependencies-versions-match.mjs",
     "check-theme-lark-imports": "node ./scripts/check-theme-lark-imports.mjs",
diff --git a/scripts/ci/validate-svg-icons.mjs b/scripts/ci/validate-svg-icons.mjs
new file mode 100644
index 00000000000..acfa9c7c10d
--- /dev/null
+++ b/scripts/ci/validate-svg-icons.mjs
@@ -0,0 +1,59 @@
+#!/usr/bin/env node
+
+/**
+ * @license Copyright (c) 2003-2025, CKSource Holding sp. z o.o. All rights reserved.
+ * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-licensing-options
+ */
+
+/* eslint-env node */
+
+// This script aims to verify whether all editor SVG icons are valid. Current criteria are:
+// - SVG icon should have a defined `viewBox`
+// - double quotation marks (") are enforced over single ones (')
+
+import fs from 'fs-extra';
+import upath from 'upath';
+import { glob } from 'glob';
+
+const svgPaths = glob.sync( upath.join( process.cwd(), 'packages', '*', 'theme', 'icons', '*.svg' ) ).sort();
+
+const singleQuotationMarksUsed = [];
+const missingViewBox = [];
+
+svgPaths.forEach( path => {
+	const file = fs.readFileSync( path, 'utf-8' );
+
+	const SVGs = file.match( /<svg[\s\S]+<\/svg>/g );
+
+	if ( SVGs.length === 0 ) {
+		throw new Error( `No SVG defined in file: ${ path }` );
+	}
+
+	if ( SVGs.length > 1 ) {
+		throw new Error( `Multiple SVGs defined in file: ${ path }` );
+	}
+
+	const SVG = SVGs[ 0 ];
+
+	if ( SVG.match( '\'' ) ) {
+		singleQuotationMarksUsed.push( path );
+	}
+
+	if ( !SVG.match( 'viewBox=' ) ) {
+		missingViewBox.push( path );
+	}
+} );
+
+if ( singleQuotationMarksUsed.length ) {
+	console.log( '\nFollowing editor icons have used single quotation marks instead of double ones:' );
+	console.log( singleQuotationMarksUsed.map( path => ` - ${ path }` ).join( '\n' ) );
+}
+
+if ( missingViewBox.length ) {
+	console.log( '\nFollowing editor icons are missing `viewBox`:' );
+	console.log( missingViewBox.map( path => ` - ${ path }` ).join( '\n' ) );
+}
+
+if ( [ ...singleQuotationMarksUsed, ...missingViewBox ].length ) {
+	process.exit( 1 );
+}