WordPress wordpress core
WordPress Core 5.9 — 5.9.1 - Authenticated (Contributor+) Stored Cross-Site Scripting
0ddb582a-e966-4c0b-a743-29d8943f846bPublished · Updated Action summary
Affected: 5.9 – <5.9.2Update to 5.9.2 or newer
All remediation stepsMedium6.4CVSS 3.16.4CISA KEVNot listedAccessUnknown
On this page3
Overview
- Advisory ID
- 0ddb582a-e966-4c0b-a743-29d8943f846b
- Product
- WordPress wordpress
- Affected
- 5.9 – <5.9.2
- Fixed in
- 5.9.2
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Unknown
- Published
- · updated
- Credit
- Ben Bidner
- Affected5.9 – < 5.9.2
- Patched in5.9.2
Update to 5.9.2 or newer.
6.4
CVSS 3.1 · CNA (Wordfence)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
WordPress Core in versions 5.9 - 5.9.1 is vulnerable to Contributor+ stored Cross-Site Scripting via the double JSON encoded payloads set in the 'isGlobalStylesUserThemeJSON' parameter which is updatable via the post editor.
Not sure which version you run? Run a passive check — it reads public files only.
Remediation & mitigations
- Update to version 5.9.2, or a newer patched version
- 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
- Advisorywordfence.com
Related CVEs
| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored DOM-Based Cross-Site Scripting via Image Alt Attribute in .wp-caption Containers | CVE-2026-120687 | |
| Medium6.4 | Authenticated (Subscriber+) Stored Cross-Site Scripting via 'Popup' Shortcode Attribute via Profile Video | CVE-2026-110531 | |
| Medium5.4 | Unauthenticated Stored Cross-Site Scripting via 'title' Attribute of [bf_login_form] Shortcode | CVE-2026-127115 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Multipart Field Name | CVE-2026-116753 |
- High7.2Unauthenticated Stored DOM-Based Cross-Site Scripting via Image Alt Attribute in .wp-caption Containers
Lightbox & Modal Popup WordPress Plugin – FooBox
≤2.8.7Update to 2.8.8
- Medium6.4Authenticated (Subscriber+) Stored Cross-Site Scripting via 'Popup' Shortcode Attribute via Profile Video
FV Player 8
≤8.1.9Update to 8.2.0
- Medium5.4Unauthenticated Stored Cross-Site Scripting via 'title' Attribute of [bf_login_form] Shortcode
BuddyForms
≤2.10.6Update to 2.10.7
- High7.2Unauthenticated Stored Cross-Site Scripting via Multipart Field Name
Multi Step for Contact Form 7
≤2.9.1Update to 2.9.2
Timeline
CVE published
Severity medium, CVSS 6.4
Record last updated
Sources & licenses
- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- 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.