CVE-2026-121458

The record

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 Attackers can use the MCP interface to retrieve private or unpublished draft content and enumerate rows from the posts system table, resulting in cross-user data disclosure.

Affected packages

Related vulnerabilities

• CVE-2026-121728 SourceHut meta.sr.ht 0.56.11 before 0.89.0 contains an authorization bypass vulnerability… CWE-862
• CVE-2026-121730 emailflare before commit cf31f33 contains a missing authorization vulnerability in POST… CWE-862
• CVE-2026-121729 emailflare before commit cf31f33 contains a missing authorization vulnerability in the… CWE-862
• CVE-2026-116663 Tanium addressed an improper access controls vulnerability in Enforce. CWE-862
• CVE-2026-121253 Missing authorization in DevTools in Google Chrome prior to 157.0.8103.38 allowed a… CWE-862
• CVE-2026-121251 Missing authorization in V8 in Google Chrome prior to 157.0.8103.38 allowed a remote… CWE-862
• CVE-2026-121194 Missing authorization in SiteIsolation in Google Chrome prior to 157.0.8103.38 allowed a… CWE-862
• CVE-2026-121199 Missing authorization in Chromoting in Google Chrome on on Mac prior to 157.0.8103.38… CWE-862