CVE-2026-42842— grav-plugin-form: XSS via Taxonomy Field Values in Admin Panel
Possible ATT&CK Techniques 1AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| getgrav | grav | < 2.0.0-beta.2 | affected |
| getgrav | grav-plugin-form | < 9.1.0 | affected |
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I. Basic Information for CVE-2026-42842
Vulnerability Information
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Vulnerability Title
grav-plugin-form: XSS via Taxonomy Field Values in Admin Panel
Source: NVD (National Vulnerability Database)
Vulnerability Description
The form plugin for Grav adds the ability to create and use forms. Prior to 9.1.0, a Stored Cross-Site Scripting (XSS) vulnerability exists in the Grav CMS Form plugin's select field template. Taxonomy tag and category values are rendered with the Twig |raw filter in the admin panel, bypassing the global autoescape protection. An editor-level user can inject arbitrary JavaScript that executes in any administrator's browser session when they view or edit any page in the admin panel. This vulnerability is fixed in 9.1.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Grav 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav是Grav开源的一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。 Grav 9.1.0之前版本存在跨站脚本漏洞，该漏洞源于select字段模板中分类标签和类别值使用Twig |raw过滤器渲染，绕过全局自动转义，可能导致编辑者级别用户注入任意JavaScript。
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 | < 2.0.0-beta.2 | - | |
| getgrav | grav-plugin-form | < 9.1.0 | - |
II. Public POCs for CVE-2026-42842
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
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- https://github.com/getgrav/grav/security/advisories/GHSA-c2q3-p4jr-c55fx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-42842
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-2026-42608 | Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component. | |
| CVE-2026-42845 | Grav: Anonymous Page Content Overwrite via Form File Upload filename Override | |
| 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
- CVE-2026-42844
Grav: Low-privileged API users can create super-admin accoun - CVE-2026-44738
Grav: Twig sandbox allows editor-role users to exfiltrate al - CVE-2026-42613
Grav: Privilege Escalation via Missing Server-Side Validatio - CVE-2026-42612
Grav: Publisher-Level Stored XSS via Unquoted Event Attribut - CVE-2026-42611
Grav: Stored XSS via Tag Injection
Same vendor: getgrav
- CVE-2026-42844
Grav: Low-privileged API users can create super-admin accoun - CVE-2026-42843
grav-plugin-api: Grav API Privilege Escalation to Super Admi - CVE-2026-44737
grav-plugin-admin: Stored Cross-Site Scripting (XSS) Reflect - CVE-2026-44738
Grav: Twig sandbox allows editor-role users to exfiltrate al - CVE-2026-42845
Grav: Anonymous Page Content Overwrite via Form File Upload
Same weakness: CWE-79
- CVE-2018-25331
Zenar Content Management System Cross-Site Scripting via aja - CVE-2021-47981
Quick.CMS 6.7 Cross-Site Scripting via CSRF to Sliders Form - CVE-2021-47975
WordPress Plugin WP Learn Manager 1.1.2 Stored XSS - CVE-2021-47957
WordPress Plugin Cookie Law Bar 1.2.1 Stored XSS via clb_bar - CVE-2021-47955
CouchCMS 2.2.1 Cross-Site Scripting via SVG File Upload
V. Comments for CVE-2026-42842
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