CVE-2025-27434
📋 TL;DR
CVE-2025-27434 is a cross-site scripting (XSS) vulnerability in SAP Commerce's Swagger UI component that allows unauthenticated attackers to inject and execute malicious JavaScript. This affects organizations running vulnerable versions of SAP Commerce with Swagger UI enabled, potentially compromising user sessions and data. The vulnerability stems from insufficient input validation in the Swagger UI interface.
💻 Affected Systems
- SAP Commerce
- SAP Commerce Cloud
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack user sessions, deface the application, or redirect users to malicious sites, leading to complete compromise of the SAP Commerce instance and associated data.
Likely Case
Attackers would typically use this to steal session cookies or authentication tokens, enabling account takeover and unauthorized access to business data within SAP Commerce.
If Mitigated
With proper input validation and output encoding implemented, the attack surface is significantly reduced, though the vulnerable component should still be patched or disabled.
🎯 Exploit Status
XSS vulnerabilities typically have low exploitation complexity, especially when unauthenticated. Attackers need to craft malicious payloads that bypass any existing filters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to SAP Note 3569602 for specific patched versions
Vendor Advisory: https://me.sap.com/notes/3569602
Restart Required: Yes
Instructions:
1. Review SAP Note 3569602 for your specific SAP Commerce version. 2. Apply the security patch provided by SAP. 3. Restart the SAP Commerce application. 4. Verify the fix by testing Swagger UI endpoints.
🔧 Temporary Workarounds
Disable Swagger UI
allDisable or restrict access to Swagger UI endpoints if not required for operations
Configure application properties to disable swagger-ui.enabled or restrict access via web server/load balancer rules
Implement WAF Rules
allDeploy Web Application Firewall rules to block XSS payloads targeting Swagger UI endpoints
Add WAF rules to detect and block script tags, JavaScript events, and other XSS patterns in requests to /swagger-ui/* paths
🧯 If You Can't Patch
- Disable Swagger UI completely in production environments
- Implement strict Content Security Policy (CSP) headers to prevent script execution from unauthorized sources
- Use network segmentation to restrict access to Swagger UI endpoints to trusted IPs only
🔍 How to Verify
Check if Vulnerable:
Test Swagger UI endpoints by attempting to inject basic XSS payloads (e.g., <script>alert('XSS')</script>) in parameters and observe if they executeCheck Version:
Check SAP Commerce version via administration console or review application properties files for version informationVerify Fix Applied:
After patching, repeat XSS testing on Swagger UI endpoints to confirm payloads are properly sanitized and do not execute📡 Detection & Monitoring
Log Indicators:
- Unusual requests to Swagger UI endpoints containing script tags or JavaScript code
- Multiple failed authentication attempts followed by Swagger UI access
Network Indicators:
- HTTP requests to /swagger-ui/* paths containing suspicious parameters with script elements or encoded payloads
SIEM Query:
source="web_server_logs" AND (url_path="/swagger-ui/*" AND (param="*<script>*" OR param="*javascript:*" OR param="*onerror=*"))