CVE-2026-125398 Instatic before 0.0.21 Authorization Bypass via Row Author Reassignment Endpoint
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-125398?
CVE-2026-125398 is a high-severity vulnerability in CoreBunch Instatic, published on 9 Nov 2026.
Official description
Instatic before 0.0.21 contains an authorization bypass vulnerability in handleRowAuthor that allows authenticated users to skip table-level access checks by loading rows with getDataRow() instead of loadRowForAccess(). Attackers holding content.edit.any but lacking data.system.tables.read can send PATCH requests to /admin/api/cms/data/rows/:id/author to read system-table rows and reassign their authors.
Weakness: CWE-862
Which versions are affected by CVE-2026-125398?
How do I fix CVE-2026-125398?
No fix has been published for CVE-2026-125398 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-125398 being exploited?
There is no known exploitation of CVE-2026-125398 in the wild and no public exploit code.
Sources
Also known as GHSA-5mp9-m5x3-58qj, GHSA-m425-wmrc-4v4v.