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CVE-2026-42841— Grav: Stored XSS via Markdown media attribute() action in Grav CMS

Quick assessment

Affected
getgrav grav
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 2.0.0-beta.2之前版本存在跨站脚本漏洞，该漏洞源于Markdown媒体操作语法中图像查询参数被转换为可调用媒体操作，可能导致认证用户注入可执行JavaScript事件处理属性。

AI Predicted 6.1 Difficulty: Easy EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
getgrav grav < 2.0.0-beta.2 affected
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I. Basic Information for CVE-2026-42841

Vulnerability Information
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Vulnerability Title
Grav: Stored XSS via Markdown media attribute() action in Grav CMS
Source: CVE Program / CVE List V5
Vulnerability Description
Grav is a file-based Web platform. Prior to 2.0.0-beta.2, an authenticated user with page editing permissions can inject an executable JavaScript event-handler attribute into rendered image HTML through Grav's Markdown media action syntax. The issue is caused by Markdown image query parameters being converted into callable media actions. The public attribute() media method can be reached this way, allowing an editor to set an arbitrary HTML attribute name and value on the generated image element. This vulnerability is fixed in 2.0.0-beta.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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 2.0.0-beta.2之前版本存在跨站脚本漏洞，该漏洞源于Markdown媒体操作语法中图像查询参数被转换为可调用媒体操作，可能导致认证用户注入可执行JavaScript事件处理属性。
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 -

II. Public POCs for CVE-2026-42841

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III. Intelligence Information for CVE-2026-42841

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Vendor Advisories for CVE-2026-42841 (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-2026-42845 Grav: Anonymous Page Content Overwrite via Form File Upload filename Override
CVE-2026-44737 grav-plugin-admin: Stored Cross-Site Scripting (XSS) Reflected endpoint /admin/pages/[page

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-79

V. Comments for CVE-2026-42841

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