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Medium

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

  • Disclosed: 03.09.2026
  • Updated: 11.10.2026 10:23

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.

Affected software

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PlatformPackageVulnerable versionsFixed in
WordPress plugin Jetpack – WP Security, Backup, Speed, & Growth = 14.5, = 14.6, = 14.7, = 14.8, >= 14.9, <= 14.9.1, >= 15.0, <= 15.0.2, >= 15.1, <= 15.1.1, = 15.2, >= 15.3, <= 15.3.1, = 15.4, = 15.5, = 15.6, >= 15.7, <= 15.7.1, = 15.8, >= 15.9, <= 15.9.1, >= 16.0, <= 16.0.1, >= 16.1, <= 16.1.2 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

References

CVSS score 6.1/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE)
CWE-79
Platform
WordPress
Package
Jetpack – WP Security, Backup, Speed, & Growth
Disclosed
03.09.2026
Updated
11.10.2026 10:23

Sources and licenses

Wordfence Intelligence - eda9ae01-cdc4-43e0-8a4c-1ec365939fa8 - Wordfence Intelligence

Copyright 2012-2026 Defiant Inc.

This record contains material that is subject to copyright

Copyright 2012-2026 Defiant Inc.

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/
Wordfence Intelligence
Wordfence Intelligence - Defiant, Inc.
Copyright Defiant, Inc. All rights reserved except as granted below.
License grant, section 3.1 of the Wordfence Intelligence Terms and Conditions (January 26, 2026):

Subject to this Agreement, Company hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Service. Any copy you make for such purposes is authorized provided that you reproduce Company’s copyright designation, this license, and the license of any disclosed Company licensor in any such copy.

Full applicable Agreement: https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/

Vulnerability history: Jetpack – WP Security, Backup, Speed, & Growth

All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (31) in the archive
Total entries
31
First → latest
08.2014 09.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 2
  • High 4
  • Medium 25

Disclosures per year

earlier: 8

Severity:
  1. Jetpack – WP Security, Backup, Speed, & Growth 16.1 - 16.1.2 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 2ae1c18c-5be3-48db-af31-4c88daa549fc >= 16.1, <= 16.1.2 16.1.3
  2. Jetpack 14.5 - 16.1.2 - Reflected to Stored Cross-Site Scripting via Reader Repost Parameters this entry
    Medium · 6.1 eda9ae01-cdc4-43e0-8a4c-1ec365939fa8 = 14.5, = 14.6, = 14.7, = 14.8, >= 14.9, <= 14.9.1, >= 15.0, <= 15.0.2, >= 15.1, <= 15.1.1, = 15.2, >= 15.3, <= 15.3.1, = 15.4, = 15.5, = 15.6, >= 15.7, <= 15.7.1, = 15.8, >= 15.9, <= 15.9.1, >= 16.0, <= 16.0.1, >= 16.1, <= 16.1.2 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
  3. Jetpack 12.0 - 16.1.2 - Authenticated (Administrator+) PHP Object Injection
    High · 7.2 72f4776f-5450-4022-92dd-47ddaa91a5cd >= 12.0, <= 12.0.2, >= 12.1, <= 12.1.2, >= 12.2, <= 12.2.2, >= 12.3, <= 12.3.1, >= 12.4, <= 12.4.1, >= 12.5, <= 12.5.1, >= 12.6, <= 12.6.3, >= 12.7, <= 12.7.2, >= 12.8, <= 12.8.2, >= 12.9, <= 12.9.4, >= 13.0, <= 13.0.1, >= 13.1, <= 13.1.4, >= 13.2, <= 13.2.3, >= 13.3, <= 13.3.2, >= 13.4, <= 13.4.4, >= 13.5, <= 13.5.1, >= 13.6, <= 13.6.1, >= 13.7, <= 13.7.1, >= 13.8, <= 13.8.2, >= 13.9, <= 13.9.1, = 14.0, = 14.1, >= 14.2, <= 14.2.1, = 14.3, >= 14.4, <= 14.4.1, = 14.5, = 14.6, = 14.7, = 14.8, >= 14.9, <= 14.9.1, >= 15.0, <= 15.0.2, >= 15.1, <= 15.1.1, = 15.2, >= 15.3, <= 15.3.1, = 15.4, = 15.5, = 15.6, >= 15.7, <= 15.7.1, = 15.8, >= 15.9, <= 15.9.1, >= 16.0, <= 16.0.1, >= 16.1, <= 16.1.2 12.0.3, 12.1.3, 12.2.3, 12.3.2, 12.4.2, 12.5.2, 12.6.4, 12.7.3, 12.8.3, 12.9.5, 13.0.2, 13.1.5, 13.2.4, 13.3.3, 13.4.5, 13.5.2, 13.6.2, 13.7.2, 13.8.3, 13.9.2, 14.0.1, 14.1.1, 14.2.2, 14.3.1, 14.4.2, 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
  4. Jetpack – WP Security, Backup, Speed, & Growth < 4.2 - Timing Attack
    Critical · 9.8 fc6dcf93-7f1f-4e87-8ba5-852d23b1f0fd < 4.2 4.2
  5. Jetpack – WP Security, Backup, Speed, & Growth < 4.2 - CSV Injection
    Critical · 9.6 f4703ca7-0677-4128-b9b7-31132ff1804d < 4.2 4.2
  6. Jetpack <= 3.7.1 - Stored Cross-Site Scripting
    High · 7.2 a1c731b9-8862-4140-b5e8-58132113e22c <= 3.7.1 3.7.2
  7. Jetpack <= 3.5.2 - Cross-Site Scripting
    High · 7.2 d8616189-5ab8-4db0-ab9e-768cc738aeb6 <= 3.5.2 3.5.3

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