CVE-2025-32974: XWiki XSS Vulnerability

CVE-2025-32974 Overview

CVE-2025-32974 is a critical vulnerability in XWiki, a generic wiki platform, where the required rights analysis fails to consider TextAreas with default content type. This flaw allows attackers with low privileges to inject malicious scripts into certain property fields that bypass XWiki's security warnings. When a user with script, admin, or programming rights subsequently edits the compromised page, the malicious scripts execute with elevated privileges.

Critical Impact

This vulnerability enables privilege escalation through stored cross-site scripting, potentially compromising the confidentiality, integrity, and availability of the entire XWiki installation.

Affected Products

• XWiki versions 15.9-rc-1 to before 15.10.8
• XWiki versions 16.0.0-rc-1 to before 16.2.0
• XWiki Platform (xwiki:xwiki component)

Discovery Timeline

• 2025-04-30 - CVE-2025-32974 published to NVD
• 2025-05-13 - Last updated in NVD database

Technical Details for CVE-2025-32974

Vulnerability Analysis

This vulnerability stems from an incomplete implementation of XWiki's required rights analysis feature introduced in version 15.9. The platform's security mechanism was designed to warn editors when page content, such as script macros, would gain elevated privileges upon editing. However, the analysis logic failed to properly evaluate TextArea properties that use the default content type.

When the getContentType() method returns null for a TextArea property, the security analysis incorrectly skips the rights check instead of treating it as the default WIKI_TEXT type. This oversight allows attackers to embed malicious scripts within these unchecked property fields. The attack succeeds when a privileged user (with script, admin, or programming rights) edits the page, inadvertently executing the injected code with their elevated permissions.

The impact is severe: successful exploitation can lead to complete compromise of the XWiki installation, including unauthorized data access, content manipulation, and potential denial of service.

Root Cause

The root cause is improper output encoding and neutralization (CWE-116) in the DefaultObjectRequiredRightAnalyzer.java component. The code failed to handle the case where TextAreaClass.getContentType() returns null, which is the default state for many TextArea configurations. Without proper null handling, the security analysis bypasses these fields entirely, treating them as safe when they may contain executable wiki content.

Attack Vector

The attack vector is network-based and requires low privileges with user interaction. An attacker must:

1. Authenticate with basic user privileges on the XWiki instance
2. Create or modify a page with a TextArea property using the default content type
3. Inject malicious script content into the unanalyzed property field
4. Wait for a privileged user to edit the compromised page
5. Upon edit, the malicious script executes with the editor's elevated privileges

// Security patch showing the fix for null content type handling
// Source: https://github.com/xwiki/xwiki-platform/commit/153dbfa2ef1a7a0a644fe3f889684c6a8738c5fc

         String contentTypeString = textAreaClass.getContentType();
         TextAreaClass.ContentType contentType =
             TextAreaClass.ContentType.getByValue(contentTypeString);
+        if (contentType == null) {
+            // Default to wiki text like TextAreaClass does.
+            contentType = TextAreaClass.ContentType.WIKI_TEXT;
+        }
         PropertyInterface field = object.getField(propertyName);

         List<RequiredRightAnalysisResult> result = List.of();

Detection Methods for CVE-2025-32974

Indicators of Compromise

• Unusual script macro content within TextArea properties with default or unspecified content types
• Page edit logs showing privileged users editing pages created by lower-privileged accounts
• Unexpected administrative actions or permission changes following page edits
• Signs of data exfiltration or unauthorized content modifications

Detection Strategies

• Monitor XWiki audit logs for page edits by privileged users on recently modified pages
• Implement content scanning for script macros in TextArea properties with null content types
• Review object property changes in wiki pages for suspicious script injection patterns
• Deploy application-level monitoring to detect privilege escalation behaviors

Monitoring Recommendations

• Enable verbose logging for XWiki security module events
• Set up alerts for administrative privilege usage following page edit operations
• Implement file integrity monitoring on XWiki configuration and data directories
• Monitor network traffic for unusual outbound connections from the XWiki server

How to Mitigate CVE-2025-32974

Immediate Actions Required

• Upgrade XWiki immediately to version 15.10.8 or 16.2.0
• Audit existing wiki pages for potentially malicious script content in TextArea properties
• Review recent edit histories to identify possible exploitation attempts
• Temporarily restrict page editing capabilities to trusted administrators if immediate patching is not possible

Patch Information

XWiki has released security patches in versions 15.10.8 and 16.2.0 that address this vulnerability. The fix ensures that TextArea properties with null content types are properly analyzed as WIKI_TEXT, the default behavior in TextAreaClass. Organizations should apply these updates immediately.

Refer to the GitHub Security Advisory (GHSA-mvgm-3rw2-7j4r) for detailed patch information. The specific fix is available in commit 153dbfa2ef1a7a0a644fe3f889684c6a8738c5fc.

Workarounds

• Restrict user registration and limit account creation to trusted administrators
• Implement strict access controls to prevent untrusted users from creating or modifying pages
• Review and restrict permissions for editing pages containing TextArea properties
• Consider temporarily disabling script execution features until patching is complete

# Configuration example
# Restrict XWiki user permissions via configuration
# Edit xwiki.cfg or xwiki.properties to limit editing capabilities

# In xwiki.cfg, set strict access control
xwiki.rights.superadmin=false

# Limit script execution rights
xwiki.authentication.active_check=false
xwiki.rights.strictRightCheck=1