diff --git a/.changeset/good-weeks-tickle.md b/.changeset/good-weeks-tickle.md
new file mode 100644
index 000000000..97c0c3660
--- /dev/null
+++ b/.changeset/good-weeks-tickle.md
@@ -0,0 +1,7 @@
+---
+'mermaid': patch
+---
+
+fix: sanitize icon labels and icon SVGs
+
+Resolves CVE-2025-54880 reported by @fourcube
diff --git a/cypress/integration/other/xss.spec.js b/cypress/integration/other/xss.spec.js
index 603e75f5d..35a493850 100644
--- a/cypress/integration/other/xss.spec.js
+++ b/cypress/integration/other/xss.spec.js
@@ -142,6 +142,17 @@ describe('XSS', () => {
     cy.get('#the-malware').should('not.exist');
   });
 
+  it('should sanitize icon labels in architecture diagrams', () => {
+    const str = JSON.stringify({
+      code: `architecture-beta
+    group api(cloud)[API]
+    service db "<img src=x onerror=\\"xssAttack()\\">" [Database] in api`,
+    });
+    imgSnapshotTest(utf8ToB64(str), {}, true);
+    cy.wait(1000);
+    cy.get('#the-malware').should('not.exist');
+  });
+
   it('should sanitize katex blocks', () => {
     const str = JSON.stringify({
       code: `sequenceDiagram
diff --git a/cypress/integration/rendering/flowchart-v2.spec.js b/cypress/integration/rendering/flowchart-v2.spec.js
index 6756c433d..8c6cde57a 100644
--- a/cypress/integration/rendering/flowchart-v2.spec.js
+++ b/cypress/integration/rendering/flowchart-v2.spec.js
@@ -1118,7 +1118,7 @@ end
       imgSnapshotTest(
         `flowchart TB
           A(["Start"]) --> n1["Untitled Node"]
-          A --> n2["Untitled Node"]     
+          A --> n2["Untitled Node"]
         `,
         {}
       );
@@ -1127,7 +1127,7 @@ end
       imgSnapshotTest(
         `flowchart BT
           n2["Untitled Node"] --> n1["Diamond"]
-          n1@{ shape: diam}     
+          n1@{ shape: diam}
         `,
         {}
       );
@@ -1138,7 +1138,7 @@ end
         n2["Untitled Node"] --> n1["Rounded Rectangle"]
         n3["Untitled Node"] --> n1
         n1@{ shape: rounded}
-        n3@{ shape: rect}  
+        n3@{ shape: rect}
     `,
         {}
       );
diff --git a/demos/sankey.html b/demos/sankey.html
index 11bb541c2..92e0f587d 100644
--- a/demos/sankey.html
+++ b/demos/sankey.html
@@ -20,14 +20,14 @@
           width: 800
           nodeAlignment: left
       ---
-     sankey   
+     sankey
         a,b,8
         b,c,8
         c,d,8
         d,e,8
-        
+
         x,c,4
-        c,y,4 
+        c,y,4
     </pre>
 
     <h2>Energy flow</h2>
diff --git a/packages/mermaid/src/diagrams/architecture/svgDraw.ts b/packages/mermaid/src/diagrams/architecture/svgDraw.ts
index f384defd8..6e470caa2 100644
--- a/packages/mermaid/src/diagrams/architecture/svgDraw.ts
+++ b/packages/mermaid/src/diagrams/architecture/svgDraw.ts
@@ -3,6 +3,7 @@ import { getConfig } from '../../diagram-api/diagramAPI.js';
 import { createText } from '../../rendering-util/createText.js';
 import { getIconSVG } from '../../rendering-util/icons.js';
 import type { D3Element } from '../../types.js';
+import { sanitizeText } from '../common/common.js';
 import type { ArchitectureDB } from './architectureDb.js';
 import { architectureIcons } from './architectureIcons.js';
 import {
@@ -271,6 +272,7 @@ export const drawServices = async function (
   elem: D3Element,
   services: ArchitectureService[]
 ): Promise<number> {
+  const config = getConfig();
   for (const service of services) {
     const serviceElem = elem.append('g');
     const iconSize = db.getConfigField('iconSize');
@@ -285,7 +287,7 @@ export const drawServices = async function (
           width: iconSize * 1.5,
           classes: 'architecture-service-label',
         },
-        getConfig()
+        config
       );
 
       textElem
@@ -320,7 +322,7 @@ export const drawServices = async function (
         .attr('class', 'node-icon-text')
         .attr('style', `height: ${iconSize}px;`)
         .append('div')
-        .html(service.iconText);
+        .html(sanitizeText(service.iconText, config));
       const fontSize =
         parseInt(
           window
diff --git a/packages/mermaid/src/docs/syntax/pie.md b/packages/mermaid/src/docs/syntax/pie.md
index 416119b5b..a311c87ef 100644
--- a/packages/mermaid/src/docs/syntax/pie.md
+++ b/packages/mermaid/src/docs/syntax/pie.md
@@ -26,7 +26,7 @@ Drawing a pie chart is really simple in mermaid.
 
 **Note:**
 
-> Pie chart values must be **positive numbers greater than zero**.  
+> Pie chart values must be **positive numbers greater than zero**.
 > **Negative values are not allowed** and will result in an error.
 
 [pie] [showData] (OPTIONAL)
diff --git a/packages/mermaid/src/rendering-util/createText.spec.ts b/packages/mermaid/src/rendering-util/createText.spec.ts
index e2e13ef7d..dd7bc00b6 100644
--- a/packages/mermaid/src/rendering-util/createText.spec.ts
+++ b/packages/mermaid/src/rendering-util/createText.spec.ts
@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest';
-import { replaceIconSubstring } from './createText.js';
+import { sanitizeText } from '../diagram-api/diagramAPI.js';
 import mermaid from '../mermaid.js';
+import { replaceIconSubstring } from './createText.js';
 
 describe('replaceIconSubstring', () => {
   it('converts FontAwesome icon notations to HTML tags', async () => {
@@ -56,7 +57,7 @@ describe('replaceIconSubstring', () => {
     ]);
     const input = 'Icons galore: fa:fa-bell';
     const output = await replaceIconSubstring(input);
-    const expected = staticBellIconPack.icons.bell.body;
+    const expected = sanitizeText(staticBellIconPack.icons.bell.body);
     expect(output).toContain(expected);
   });
 });
diff --git a/packages/mermaid/src/rendering-util/icons.ts b/packages/mermaid/src/rendering-util/icons.ts
index 50b1bbeb9..65f35bc62 100644
--- a/packages/mermaid/src/rendering-util/icons.ts
+++ b/packages/mermaid/src/rendering-util/icons.ts
@@ -1,7 +1,9 @@
-import { log } from '../logger.js';
 import type { ExtendedIconifyIcon, IconifyIcon, IconifyJSON } from '@iconify/types';
 import type { IconifyIconCustomisations } from '@iconify/utils';
 import { getIconData, iconToHTML, iconToSVG, replaceIDs, stringToIcon } from '@iconify/utils';
+import { getConfig } from '../config.js';
+import { sanitizeText } from '../diagrams/common/common.js';
+import { log } from '../logger.js';
 
 interface AsyncIconLoader {
   name: string;
@@ -100,5 +102,5 @@ export const getIconSVG = async (
     ...renderData.attributes,
     ...extraAttributes,
   });
-  return svg;
+  return sanitizeText(svg, getConfig());
 };