CVE-2026-0505
📋 TL;DR
This CVE describes an unvalidated redirect vulnerability in BSP applications where unauthenticated attackers can manipulate URL parameters to redirect users to malicious websites. This affects systems running vulnerable BSP applications with exposed web interfaces. The impact is primarily on user trust and potential credential theft through phishing.
💻 Affected Systems
- SAP BSP applications
📦 What is this software?
Erp by Sap
⚠️ Risk & Real-World Impact
Worst Case
Users are redirected to convincing phishing sites that steal credentials, session tokens, or install malware, leading to account compromise and data exfiltration.
Likely Case
Attackers use crafted links in phishing campaigns to redirect legitimate users to malicious sites for credential harvesting or malware distribution.
If Mitigated
With proper input validation and URL whitelisting, redirections are restricted to trusted domains only, preventing exploitation.
🎯 Exploit Status
Exploitation requires crafting malicious URLs but is straightforward for attackers with basic web skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check SAP Security Patch Day updates and Note 3678417
Vendor Advisory: https://me.sap.com/notes/3678417
Restart Required: Yes
Instructions:
1. Review SAP Note 3678417 for specific patch details. 2. Apply the relevant SAP Security Patch Day updates. 3. Restart affected BSP application services. 4. Test functionality post-patch.
🔧 Temporary Workarounds
Implement URL validation
allAdd server-side validation to ensure redirect URLs are from trusted domains only.
Use relative URLs
allModify BSP applications to use relative URLs instead of absolute URLs for redirects.
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block malicious redirect patterns
- Educate users about phishing risks and verify URLs before clicking
🔍 How to Verify
Check if Vulnerable:
Test BSP applications by attempting to redirect to external domains via URL parameters; if successful without validation, vulnerable.Check Version:
Check SAP system version via transaction code SM51 or consult SAP Note 3678417 for version compatibility.Verify Fix Applied:
After patching, retest redirect attempts; they should fail or be restricted to trusted domains.📡 Detection & Monitoring
Log Indicators:
- Unusual redirect patterns in web server logs
- Requests with external URLs in redirect parameters
Network Indicators:
- Outbound connections to suspicious domains following redirects
- HTTP 302 responses to non-whitelisted domains
SIEM Query:
source="web_logs" AND (url="*redirect=*http://*" OR url="*redirect=*https://*") AND NOT url="*redirect=*trusted-domain.com*"