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How the mentioned CVE works:
Wagtail’s admin preview endpoints lack proper permission checks in affected versions. Users with Wagtail admin access can craft form submissions to preview any page, snippet, or site setting object with previews enabled. By knowing model fields, attackers submit custom data to these endpoints. The preview rendering uses submitted data instead of actual object data from the database. While existing object data isn’t exposed, template rendering may execute queries or logic accessing other database contents. This can disclose information otherwise restricted to users with edit permissions. The vulnerability lies in missing authorization validation before rendering previews. Attackers must have admin credentials, making it an insider threat. Exploitation involves sending POST requests to preview URLs with manipulated form parameters. The system fails to verify if the user has permission to view the specific object being previewed. Patched versions add permission checks to ensure users have edit rights for the object. Without patches, any admin user can bypass fine-grained access controls. This indirect information disclosure is rated moderate due to required admin access and no direct data leakage. The preview endpoints handle requests without validating object-level permissions, relying solely on general admin access. Crafted requests can trigger template code that fetches related data, potentially exposing sensitive records. The issue affects multiple Wagtail versions where preview functionality is enabled. Fixes involve adding permission checks in the view functions for preview endpoints.
Platform: Wagtail
Version: See affected versions
Vulnerability: Improper permission handling
Severity: Moderate
date: Feb 3 2026
Prediction: Patches released
What Undercode Say:
Analytics:
- Check version: `python -c “import wagtail; print(wagtail.__version__)”`
– Update package: `pip install –upgrade wagtail`
– Test preview endpoint: `curl -X POST http://localhost/admin/preview/ -H “Cookie: sessionid=…” -d “data=malicious”`
how Exploit:
- Gain admin access to Wagtail.
- Identify model fields via admin interface.
- Craft POST request to preview endpoint with object ID and custom data.
- Submit form to render preview, potentially exposing database contents through template queries.
Protection from this CVE:
- Upgrade to patched versions: 6.3.6, 7.0.4, 7.1.3, 7.2.2, or 7.3.
- Review admin user permissions regularly.
- Implement network controls to limit admin access.
Impact:
- Information disclosure via preview rendering.
- Requires admin credentials for exploitation.
- No direct data loss or system compromise.
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Sources:
Reported By: github.com
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