Gutenberg 12.9.0 — 18.0.0 - Unauthenticated & Authenticated (Contributor+) Stored Cross-Site Scripting via Avatar Block
63f26380-0bc2-4fe7-9e9d-05c688c201f9Published · Updated Action summary
Affected: 12.9.0 – 18.0.0Update to 18.01 or newer
All remediation steps- Severity
- Medium6.4
- CVSS
- 6.4CVSS 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
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Gutenberg gutenberg
- Affected12.9.0 – 18.0.0
- Patched in18.01
Update to 18.01 or newer.
You are affected if you run 12.9.0 – 18.0.0. Version 18.01 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Gutenberg.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 18.01, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Gutenberg to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to John Blackbourn, stealthcopter.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Gutenberg
All 6| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤21.8.2Update to 21.9.0 | CVE-2025-64354 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via Template Part Block ≤6.5.4Update to 5.9.10 or 6.0.9 or 6.1.7 or 6.2.6 or 6.3.5 or 6.4.5 or 6.5.5 | CVE-2024-31111 | |
| Medium6.4 | Authenticated(Contributor+) Stored Cross-Site Scripting via Navigation Attributes ≤6.3.1Update to 5.9.8 or 6.0.6 or 6.1.4 or 6.2.3 or 6.3.2 | CVE-2023-38000 | |
| Medium6.4 | Authenticated Cross-Site Scripting in Various Blocks ≤6.0.2Update to 3.7.40 or 3.8.40 or 3.9.38 or 4.0.37 or 4.1.37 or 4.2.34 or 4.3.30 or 4.4.29 or 4.5.28 or 4.6.25 or 4.7.25 or 4.8.21 or 4.9.22 or 5.0.18 or 5.1.15 or 5.2.17 or 5.3.14 or 5.4.12 or 5.5.11 or 5.6.10 or 5.7.8 or 5.8.6 or 5.9.5 or 6.0.3 | CVE-2022-43500 | |
| Medium5.4 | Prototype Pollution via Block Editor ≤5.9.1Update to 3.7.38 or 3.8.38 or 3.9.36 or 4.0.35 or 4.1.35 or 4.2.32 or 4.3.28 or 4.4.27 or 4.5.26 or 4.6.23 or 4.7.23 or 4.8.19 or 4.9.20 or 5.0.16 or 5.1.13 or 5.2.15 or 5.3.12 or 5.4.10 or 5.5.9 or 5.6.8 or 5.7.6 or 5.8.4 or 5.9.2 | — |
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤21.8.2Update to 21.9.0
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via Template Part Block
≤6.5.4Update to 5.9.10 or 6.0.9 or 6.1.7 or 6.2.6 or 6.3.5 or 6.4.5 or 6.5.5
- Medium6.4Authenticated(Contributor+) Stored Cross-Site Scripting via Navigation Attributes
≤6.3.1Update to 5.9.8 or 6.0.6 or 6.1.4 or 6.2.3 or 6.3.2
- Medium6.4Authenticated Cross-Site Scripting in Various Blocks
≤6.0.2Update to 3.7.40 or 3.8.40 or 3.9.38 or 4.0.37 or 4.1.37 or 4.2.34 or 4.3.30 or 4.4.29 or 4.5.28 or 4.6.25 or 4.7.25 or 4.8.21 or 4.9.22 or 5.0.18 or 5.1.15 or 5.2.17 or 5.3.14 or 5.4.12 or 5.5.11 or 5.6.10 or 5.7.8 or 5.8.6 or 5.9.5 or 6.0.3
- Medium5.4Prototype Pollution via Block Editor
≤5.9.1Update to 3.7.38 or 3.8.38 or 3.9.36 or 4.0.35 or 4.1.35 or 4.2.32 or 4.3.28 or 4.4.27 or 4.5.26 or 4.6.23 or 4.7.23 or 4.8.19 or 4.9.20 or 5.0.16 or 5.1.13 or 5.2.15 or 5.3.12 or 5.4.10 or 5.5.9 or 5.6.8 or 5.7.6 or 5.8.4 or 5.9.2
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- 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
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity medium, CVSS 6.4
Record last updated
Sources & licenses
- Vulnerability data
- Wordfence Intelligence. [object Object] 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.