CVE-2023-29526
📋 TL;DR
This vulnerability in XWiki Platform allows attackers to bypass access controls and execute arbitrary code through specially crafted comments containing async or display macros. When viewed, these macros execute server-side, enabling remote code execution. All XWiki instances running affected versions are vulnerable.
💻 Affected Systems
- XWiki Platform
📦 What is this software?
Xwiki by Xwiki
Xwiki by Xwiki
Xwiki by Xwiki
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, lateral movement, and persistent backdoor installation.
Likely Case
Unauthorized access to restricted pages and potential code execution leading to data exposure.
If Mitigated
Limited impact if network segmentation and strict access controls prevent exploitation attempts.
🎯 Exploit Status
Exploitation requires ability to create or edit comments, but detailed technical information is available in public advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: XWiki 15.0-rc-1, 14.10.3, 14.4.8, or 13.10.11
Vendor Advisory: https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-gpq5-7p34-vqx5
Restart Required: Yes
Instructions:
1. Backup your XWiki instance. 2. Download and install patched version from xwiki.org. 3. Follow XWiki upgrade documentation. 4. Restart application server.
🧯 If You Can't Patch
- Disable comment functionality globally
- Implement strict network access controls to limit XWiki exposure
🔍 How to Verify
Check if Vulnerable:
Check XWiki version in administration panel or via xwiki.cfg file. If version is below patched versions, system is vulnerable.Check Version:
Check Administration → About in XWiki web interface or examine xwiki.cfg configuration file.Verify Fix Applied:
Confirm XWiki version is 13.10.11, 14.4.8, 14.10.3, or 15.0-rc-1 or higher.📡 Detection & Monitoring
Log Indicators:
- Unusual comment creation/editing patterns
- Macro execution errors in server logs
- Access to restricted pages from unauthorized users
Network Indicators:
- Unusual POST requests to comment endpoints
- Traffic patterns suggesting macro exploitation
SIEM Query:
Search for 'async macro' or 'display macro' in comment content or unusual access to protected pages.🔗 References
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-gpq5-7p34-vqx5
- https://jira.xwiki.org/browse/XRENDERING-694
- https://jira.xwiki.org/browse/XWIKI-20394
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-gpq5-7p34-vqx5
- https://jira.xwiki.org/browse/XRENDERING-694
- https://jira.xwiki.org/browse/XWIKI-20394
