Instatic before 0.0.21 contains a missing authorization vulnerability in its AI/MCP content read tools that allows low-privileged authenticated users with ai.chat and content.edit.own capabilities to access data rows belonging to other users by calling content_get_document and content_list_documents without the object-level authorization checks enforced by the normal HTTP API. Attackers can use the MCP interface to retrieve private or unpublished draft content and enumerate rows from the posts system table, resulting in cross-user data disclosure.
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Fixes

Solution

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Workaround

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History

Tue, 03 Nov 2026 13:15:00 +0000

Type Values Removed Values Added
Description Instatic before 0.0.21 contains a missing authorization vulnerability in its AI/MCP content read tools that allows low-privileged authenticated users with ai.chat and content.edit.own capabilities to access data rows belonging to other users by calling content_get_document and content_list_documents without the object-level authorization checks enforced by the normal HTTP API. Attackers can use the MCP interface to retrieve private or unpublished draft content and enumerate rows from the posts system table, resulting in cross-user data disclosure.
Title Instatic before 0.0.21 Authorization Bypass via MCP Content Read Tools
First Time appeared Corebunch
Corebunch instatic
Weaknesses CWE-862
CPEs cpe:2.3:a:corebunch:instatic:*:*:*:*:*:*:*:*
Vendors & Products Corebunch
Corebunch instatic
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-03T12:59:17.285Z

Reserved: 2026-11-03T12:47:04.613Z

Link: CVE-2026-121458

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-03T13:17:21.997

Modified: 2026-11-03T13:17:21.997

Link: CVE-2026-121458

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-03T14:45:17Z

Weaknesses