Reported vulnerability

Jetpack 14.5 - 16.1.2 - Reflected to Stored Cross-Site Scripting via Reader Repost Parameters

Published 3 Sept 2026

Updated 4 Sept 2026

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 6.1

The Jetpack – WP Security, Backup, Speed, & Growth plugin for WordPress is vulnerable to Cross-Site Scripting in versions 14.5 through 16.1.2 via the Reader repost initializer in the block editor bundles. The initializer reads the url, title, text, comment_content, and comment_author query parameters and interpolates them into block attributes without escaping or sanitization before calling resetEditorBlocks(). On WordPress 7.1, only title and url were demonstrated to persist into live executable markup; the other parameters did not produce a stored executable sink. This makes it possible for unauthenticated attackers to inject arbitrary web scripts into a post via a crafted link that, when opened and saved by a user with the unfiltered_html capability (administrator or editor by default), stores the payload in post_content where it executes in the browser of every subsequent visitor to the published post. The Blocks module must be active and the site must be Jetpack-connected or in offline mode for the vulnerable bundle to be enqueued.

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

Jetpack – WP Security, Backup, Speed, & Growth

Software: plugin · jetpack
Affected versions: From 14.5, through 14.5; From 14.6, through 14.6; From 14.7, through 14.7; From 14.8, through 14.8; From 14.9, through 14.9.1; From 15.0, through 15.0.2; From 15.1, through 15.1.1; From 15.2, through 15.2; From 15.3, through 15.3.1; From 15.4, through 15.4; From 15.5, through 15.5; From 15.6, through 15.6; From 15.7, through 15.7.1; From 15.8, through 15.8; From 15.9, through 15.9.1; From 16.0, through 16.0.1; From 16.1, through 16.1.2
Fix availability: Fix available
Fixed versions: 14.5.1, 14.6.1, 14.7.1, 14.8.1, 14.9.2, 15.0.3, 15.1.2, 15.2.1, 15.3.2, 15.4.1, 15.5.1, 15.6.1, 15.7.2, 15.8.1, 15.9.2, 16.0.2, 16.1.3

Recommended action

Update to one of the following versions, or a newer patched version: 14.5.1, 14.6.1, 14.7.1, 14.8.1, 14.9.2, 15.0.3, 15.1.2, 15.2.1, 15.3.2, 15.4.1, 15.5.1, 15.6.1, 15.7.2, 15.8.1, 15.9.2, 16.0.2, 16.1.3

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/eda9ae01-cdc4-43e0-8a4c-1ec365939fa8?source=api-prod

Data sources and licences

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Source: Wordfence

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Questions about this vulnerability

Which versions of Jetpack – WP Security, Backup, Speed, & Growth are affected?

Wordfence lists these affected versions: From 14.5, through 14.5; From 14.6, through 14.6; From 14.7, through 14.7; From 14.8, through 14.8; From 14.9, through 14.9.1; From 15.0, through 15.0.2; From 15.1, through 15.1.1; From 15.2, through 15.2; From 15.3, through 15.3.1; From 15.4, through 15.4; From 15.5, through 15.5; From 15.6, through 15.6; From 15.7, through 15.7.1; From 15.8, through 15.8; From 15.9, through 15.9.1; From 16.0, through 16.0.1; From 16.1, through 16.1.2. Use the version checker above to compare your installed release with this report.

Is a fix available for Jetpack – WP Security, Backup, Speed, & Growth?

Wordfence reports a fix for this issue in Jetpack – WP Security, Backup, Speed, & Growth. It lists these fixed versions: 14.5.1, 14.6.1, 14.7.1, 14.8.1, 14.9.2, 15.0.3, 15.1.2, 15.2.1, 15.3.2, 15.4.1, 15.5.1, 15.6.1, 15.7.2, 15.8.1, 15.9.2, 16.0.2, 16.1.3. 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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