CVE-2020-37256

Analyzed Analyzed - Analysis Complete

Grav Admin Plugin XSS Vulnerability

Publication date: 2026-06-25

Last updated on: 2026-06-27

Assigner: VulnCheck

Description

Grav before 1.6.30 contains a cross-site scripting vulnerability in the Admin plugin page editor default security configuration. Privileged users with page editing capabilities can inject malicious scripts to execute arbitrary code and install malicious plugins for system access.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-06-25

Last Modified

2026-06-27

Generated

2026-07-16

AI Q&A

2026-06-26

EPSS Evaluated

2026-07-15

NVD

CVE-2020-37256

EUVD

EUVD-2020-31260

Affected Vendors & Products

Vendor	Product	Version / Range
getgrav	grav	to 1.6.30 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Grav versions before 1.6.30 within the Admin plugin's page editor default security configuration. It is a cross-site scripting (XSS) vulnerability that allows privileged users who have page editing capabilities to inject malicious scripts.

These malicious scripts can execute arbitrary code and enable the installation of malicious plugins, potentially giving attackers system access.

Impact Analysis

The vulnerability can lead to unauthorized code execution and installation of malicious plugins by privileged users with page editing rights.

This could compromise the integrity and security of the system, potentially allowing attackers to gain system access and perform unauthorized actions.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Grav CMS to version 1.6.30 or later, where the issue has been patched.

Ensure that only trusted privileged users have page editing capabilities, as the vulnerability requires such privileges to be exploited.

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