Reported vulnerability

Gutenberg 12.9.0 - 18.0.0 - Unauthenticated & Authenticated (Contributor+) Stored Cross-Site Scripting via Avatar Block

Published 9 Apr 2024

Updated 10 Apr 2024

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

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Wordfence advisory

medium · CVSS 6.4

The Gutenberg plugin for WordPress is vulnerable to Stored Cross-Site Scripting via user display names in the Avatar block in versions 12.9.0 to 18.0.0 due to insufficient output escaping on the display name. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. In addition, it also makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that have the comment block present and display the comment author's avatar.

Severity vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Gutenberg

Software: plugin · gutenberg
Affected versions: From 12.9.0, through 18.0.0
Fix availability: Fix available
Fixed versions: 18.01

Recommended action

Update to version 18.01, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/63f26380-0bc2-4fe7-9e9d-05c688c201f9?source=api-prod

Data sources and licences

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Source: Wordfence

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Questions about this vulnerability

Which versions of Gutenberg are affected?

Wordfence lists these affected versions: From 12.9.0, through 18.0.0. Use the version checker above to compare your installed release with this report.

Is a fix available for Gutenberg?

Wordfence reports a fix for this issue in Gutenberg. It lists these fixed versions: 18.01. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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