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WordPress wordpress core

WordPress Core 5.4 — 5.8 - Authenticated Stored Cross-Site Scripting

CVE-2021-39201Published · Updated

Action summary

Affected: <5.8.1Update to 5.4.7 or 5.5.6 or 5.6.5 or 5.7.3 or 5.8.1 or newer

Fixed versions are per release branch: update to the fix for the branch you run.

All remediation steps
Watch core
High7.6CVSS 3.17.6CISA KEVNot listedAccessUnknown
On this page3

Overview

Advisory ID
CVE-2021-39201
Product
WordPress wordpress
Affected
<5.8.1
Fixed in
5.4.7, 5.5.6, 5.6.5, 5.7.3, 5.8.1
Required access
Unknown
Published
· updated
Credit
Michał Bentkowski
  1. Affected< 5.8.1
  2. Patched in5.4.7 / 5.5.6 / 5.6.5 / 5.7.3 / 5.8.1

Update to 5.4.7 / 5.5.6 / 5.6.5 / 5.7.3 / 5.8.1 or newer.

7.6
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:L Privileges required
Low
UI:R User interaction
Required
S:C Scope
Changed
C:H Confidentiality
High
I:L Integrity
Low
A:N Availability
None

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. ### Impact The issue allows an authenticated but low-privileged user (like contributor/author) to execute XSS in the editor. This bypasses the restrictions imposed on users who do not have the permission to post unfiltered_html. ### Patches This has been patched in WordPress 5.8, and will be pushed to older versions via minor releases (automatic updates). It's strongly recommended that you keep auto-updates enabled to receive the fix. ### References https://wordpress.org/news/category/releases/ https://hackerone.com/reports/1142140 ### For more information If you have any questions or comments about this advisory: * Open an issue in [HackerOne](https://hackerone.com/wordpress)

Not sure which version you run? Run a passive check — it reads public files only.

Remediation & mitigations

  1. Update to one of the following versions, or a newer patched version: 5.4.7, 5.5.6, 5.6.5, 5.7.3, 5.8.1
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.

References & provenance

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

Related CVEs

Other Cross-Site Scripting vulnerabilities
SeverityVulnerabilityCVEPublished
Medium6.4Authenticated (Contributor+) DOM-Based Stored Cross-Site Scripting via 'data-text-sec', 'data-title', and 'title' Attributes via Custom HTML Block
Flatsome≤3.20.12Update to 3.20.13
CVE-2026-18742
High7.1Unauthenticated PHP Object Injection to Arbitrary File Deletion via 'comment_content'/'comment_agent' Parameter during Attachment Rename
Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization≤4.2.19Update to 4.2.20VulnCrest analysis
CVE-2026-124969
Critical9.8Missing Authorization to Unauthenticated Arbitrary User Password Reset / Account Takeover via Webhook with 'Is the user ID' Field
AutomatorWP Webhooks≤1.4.4Update to 1.4.5
CVE-2026-126173
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688

Timeline

  1. CVE published

    Severity high, CVSS 7.6

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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