CVE-2026-125398— Instatic before 0.0.21 Authorization Bypass via Row Author Reassignment Endpoint

Quick assessment

Affected

CoreBunch Instatic

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Instatic 0.0.21 之前的版本中，函数存在一个授权绕过漏洞。该漏洞允许已认证用户通过调用而非来加载行数据，从而绕过表级访问检查。攻击者若拥有权限但缺少权限，仍可发送 PATCH 请求至接口，读取系统表中的行数据并重新分配其作者。

CVSS 7.1 · High Updated Nov 10, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Instatic before 0.0.21 Authorization Bypass via Row Author Reassignment Endpoint

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

授权机制缺失

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
CoreBunch	Instatic	0 ~ 0.0.21	-

II. Public POCs for CVE-2026-125398

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-125398

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Other References for CVE-2026-125398 (5)

https://github.com/CoreBunch/Instatic/commit/ff1e51eb59c860864fa24e8c3e2716b56314f3ad patch
https://github.com/CoreBunch/Instatic/blob/v0.0.20/server/handlers/cms/data/rows.ts#L378-L398 technical-description
https://github.com/CoreBunch/Instatic/releases/tag/v0.0.21 release-notes
https://github.com/CoreBunch/Instatic/security/advisories/GHSA-m425-wmrc-4v4v vendor-advisory
https://www.vulncheck.com/advisories/instatic-before-0.0.21-authorization-bypass-via-row-author-reassignment-endpoint third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-125398

IV. Related Vulnerabilities

Same product: Instatic

Same vendor: CoreBunch

Same weakness: CWE-862