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CVE-2026-42845— Grav: Anonymous Page Content Overwrite via Form File Upload filename Override

Quick assessment

Affected
getgrav grav-plugin-form
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.

Grav CMS是Grav开源的一个基于文件的扁平化内容管理系统。 Grav CMS 9.1.0之前版本存在安全漏洞，该漏洞源于文件上传时未剥离路径组件且未硬性阻止页面内容扩展名，可能导致未认证用户覆盖页面内容。

AI Predicted 9.8 Difficulty: Easy EPSS 0.45% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
getgrav grav-plugin-form < 9.1.0 affected
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I. Basic Information for CVE-2026-42845

Vulnerability Information
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Vulnerability Title
Grav: Anonymous Page Content Overwrite via Form File Upload filename Override
Source: CVE Program / CVE List V5
Vulnerability Description
The form plugin for Grav adds the ability to create and use forms. Prior to 9.1.0 , there is an unauthenticated page-content overwrite via file upload (GHSA-w4rc-p66m-x6qq). Public form uploads now strip path components from the POST-supplied filename and hard-block page-content extensions (`md`, `yaml`, `yml`, `json`, `twig`, `ini`) regardless of the configurable dangerous-extensions list. A permissive `accept` policy combined with the default `destination: self@` could otherwise let an attacker overwrite the page's own `.md` and pivot to super-admin via a `process: save` action. This vulnerability is fixed in 9.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
Grav CMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav CMS是Grav开源的一个基于文件的扁平化内容管理系统。 Grav CMS 9.1.0之前版本存在安全漏洞，该漏洞源于文件上传时未剥离路径组件且未硬性阻止页面内容扩展名，可能导致未认证用户覆盖页面内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getgrav grav-plugin-form < 9.1.0 -

II. Public POCs for CVE-2026-42845

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III. Intelligence Information for CVE-2026-42845

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Patches & Fixes for CVE-2026-42845 (1)

Vendor Advisories for CVE-2026-42845 (1)

Same Patch Batch · getgrav · 2026-05-11 · 13 CVEs total

CVE-2026-42613 9.4 CRITICAL Grav: Privilege Escalation via Missing Server-Side Validation of groups/access
CVE-2026-42607 9.1 CRITICAL Grav: Remote Code Execution (RCE) via Malicious Plugin ZIP Upload in Direct Install Featur
CVE-2026-42611 8.9 HIGH Grav: Stored XSS via Tag Injection
CVE-2026-42843 8.8 HIGH grav-plugin-api: Grav API Privilege Escalation to Super Admin
CVE-2026-42612 8.5 HIGH Grav: Publisher-Level Stored XSS via Unquoted Event Attributes
CVE-2026-42609 8.1 HIGH Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Log
CVE-2026-44738 7.7 HIGH Grav: Twig sandbox allows editor-role users to exfiltrate all plugin secrets via Config::t
CVE-2026-42610 6.5 MEDIUM Grav: Sensitive Information Disclosure via Accounts Service Bypass
CVE-2026-42842 5.4 MEDIUM grav-plugin-form: XSS via Taxonomy Field Values in Admin Panel
CVE-2026-42608 Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component.
CVE-2026-42841 Grav: Stored XSS via Markdown media attribute() action in Grav CMS
CVE-2026-44737 grav-plugin-admin: Stored Cross-Site Scripting (XSS) Reflected endpoint /admin/pages/[page

IV. Related Vulnerabilities

Same product: grav-plugin-form
Same vendor: getgrav
Same weakness: CWE-73

V. Comments for CVE-2026-42845

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