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GHSA-rmw5-f87r-w988medium6.2

Grav Admin Plugin is vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/accounts/groups/[group]` parameter `data[readableName]`

Impact

A Stored Cross-Site Scripting (XSS) vulnerability was identified in the /admin/accounts/groups/Grupo endpoint of the _Grav_ application. This vulnerability allows attackers to inject malicious scripts into the data[readableName] parameter. The injected scripts are stored on the server and executed automatically whenever the affected page is accessed by users, posing a significant security risk.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

getgrav/grav Packagist
Affected rangeRecorded fix
Earlier releases before 1.8.0-beta.27Ecosystem versions1.8.0-beta.27

Version evidence: OSV · GHSA-rmw5-f87r-w988

View original version evidence (317 explicit versions)

Original source description

Summary

A Stored Cross-Site Scripting (XSS) vulnerability was identified in the /admin/accounts/groups/Grupo endpoint of the Grav application. This vulnerability allows attackers to inject malicious scripts into the data[readableName] parameter. The injected scripts are stored on the server and executed automatically whenever the affected page is accessed by users, posing a significant security risk.

Details

Vulnerable Endpoint: POST /admin/accounts/groups/Grupo
Parameter: data[readableName]

The application fails to properly validate and sanitize user input in the data[readableName] parameter. This lack of input handling allows attackers to inject arbitrary script content that is stored in the application and executed in the browser of any user who views the affected group configuration.

PoC

Payload:

<ScRipT>alert('PoC-XSS')</ScRipT>

  1. Navigate to Accounts > Groups in the administrative panel.

  2. Create a new group or edit an existing one.

  3. In the Display Name field (data[readableName]), insert the payload above and save the changes.

image

The following HTTP request was generated during this action: image

  1. Next, go to Accounts > Users and open any user profile.

image

  1. The malicious script is executed immediately in the browser when the page loads, confirming the existence of a Stored XSS vulnerability.

image

Impact

Stored XSS vulnerabilities can result in serious consequences, including:

  • Session hijacking: Attackers can steal authentication cookies or tokens

  • Malware delivery: Inserting scripts that download malicious content

  • Credential theft: Capturing usernames and passwords through injected forms

  • Sensitive data exposure: Accessing data stored in the browser or the application

  • Browser takeover: Executing arbitrary commands in the user’s session

  • Phishing attacks: Redirecting users to fake login or malicious sites

  • Website defacement: Altering page content shown to users

  • Reputational damage: Undermining trust in the platform or organization

by CVE-Hunters

References