CVE-2025-10552: 3DSwymer XSS Vulnerability

CVE-2025-10552 Overview

CVE-2025-10552 is a stored Cross-Site Scripting (XSS) vulnerability in the 3DSwym component of Dassault Systèmes 3DSwymer on Release 3DEXPERIENCE R2025x. Attackers can inject persistent script payloads that execute in the browser session of any user who views the affected content. The flaw is tracked under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Exploitation requires user interaction, but no authentication is needed to deliver the payload over the network. Successful attacks can hijack sessions, steal tokens, or perform actions on behalf of victims within the 3DEXPERIENCE platform.

Critical Impact
Stored XSS in a collaborative enterprise platform allows attackers to compromise user sessions, exfiltrate confidential engineering data, and pivot across the 3DEXPERIENCE tenant.

Affected Products

Dassault Systèmes 3DSwymer on Release 3DEXPERIENCE R2025x
3DSwym component within 3DSwymer
Deployments exposing 3DSwym collaborative content to authenticated or public users

Discovery Timeline

2025-10-13 - CVE-2025-10552 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-10552

Vulnerability Analysis

The vulnerability resides in 3DSwym, the social collaboration component of 3DSwymer within the 3DEXPERIENCE platform. User-supplied content submitted through 3DSwym is stored server-side without sufficient output encoding or input sanitization. When another user renders the affected page, the browser interprets the attacker-controlled markup as executable script.

Because the payload is persistent, a single injection can affect every user who visits the compromised communities, posts, or comments. The CVSS vector indicates a scope change, meaning the injected script executes in a security context beyond the vulnerable component itself, typically the authenticated user's browser session in the wider 3DEXPERIENCE tenant.

Root Cause

The root cause is improper neutralization of user input during web page generation ([CWE-79]). 3DSwym renders stored content back into HTML contexts without contextual escaping of dangerous characters such as <, >, ", and '. HTML event handlers and <script> blocks remain intact after storage and are executed at render time.

Attack Vector

An attacker submits crafted content, such as a post, comment, or profile field, containing script markup into 3DSwym. The payload is stored in the application's backend. When a legitimate user browses the affected 3DSwym page, the payload executes with the victim's privileges. Typical outcomes include session cookie theft, cross-tenant data harvesting, unauthorized API calls to 3DEXPERIENCE services, and phishing overlays delivered from a trusted origin.

No verified public proof-of-concept code is available. See the 3DS Security Advisory CVE-2025-10552 for vendor-provided technical details.

Detection Methods for CVE-2025-10552

Indicators of Compromise

Stored 3DSwym content containing <script>, onerror=, onload=, or javascript: URI patterns in posts, comments, or profile fields
Outbound requests from user browsers to unfamiliar domains immediately after loading 3DSwym pages
Anomalous 3DEXPERIENCE API calls originating from user sessions shortly after 3DSwym page visits
Session token reuse from unexpected IP addresses or user agents

Detection Strategies

Review 3DSwym database entries for HTML tags, event handlers, and encoded script fragments in user-submitted fields
Enable web server and WAF logging on 3DEXPERIENCE endpoints and alert on payloads matching common XSS signatures
Inspect Content Security Policy (CSP) violation reports for blocked inline script executions on 3DSwym pages
Correlate authentication events with browser telemetry to identify sessions used from multiple geolocations within short intervals

Monitoring Recommendations

Forward 3DEXPERIENCE application, proxy, and WAF logs to a centralized analytics platform for retention and query
Baseline normal 3DSwym posting behavior and alert on high-volume submissions containing HTML markup
Monitor administrative and privileged accounts for unexpected activity following 3DSwym page views
Track user reports of unexpected pop-ups, redirects, or session terminations within 3DSwymer

How to Mitigate CVE-2025-10552

Immediate Actions Required

Apply the vendor-supplied fix documented in the 3DS Security Advisory CVE-2025-10552
Audit existing 3DSwym content for stored payloads and remove or sanitize any suspicious entries
Rotate session tokens and credentials for users who interacted with potentially compromised 3DSwym pages
Restrict 3DSwym posting privileges to trusted users until the patch is deployed

Patch Information

Dassault Systèmes has published a security advisory for CVE-2025-10552 covering 3DSwymer on 3DEXPERIENCE R2025x. Refer to the official advisory for the specific hotfix, cumulative update, or FixPack applicable to your deployment. Customer access to patches requires a valid Dassault Systèmes support account.

Workarounds

Enforce a strict Content Security Policy that disallows inline scripts and untrusted origins on 3DEXPERIENCE hosts
Deploy a WAF rule to block requests containing <script, javascript:, and common event-handler attributes in 3DSwym submission endpoints
Set the HttpOnly and Secure flags on 3DEXPERIENCE session cookies to reduce token theft impact
Limit public and guest access to 3DSwym communities until the patch is applied

bash

# Example CSP header to reduce XSS impact on 3DEXPERIENCE front-ends
Content-Security-Policy: default-src 'self'; \
  script-src 'self'; \
  object-src 'none'; \
  base-uri 'self'; \
  frame-ancestors 'self'; \
  report-uri /csp-report