Advanced Custom Fields: Extended <= 0.9.2.7 — Missing Authorization to Unauthenticated Data Exposure via Multiple AJAX Endpoints
CVE-2026-2839Published · Updated Action summary
Affected: ≤0.9.2.7Update to 0.9.2.8 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:LConfidentiality- Low
I:NIntegrity- None
A:NAvailability- None
- Weakness
- CWE-862 Missing Authorization
- Required access
- No account needed
- Exploit prediction (EPSS)
- 0.3% chance in 30 days20th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
Advanced Custom Fields: Extended acf-extended
- Affected≤ 0.9.2.7
- Patched in0.9.2.8
Update to 0.9.2.8 or newer.
You are affected if you run ≤ 0.9.2.7. Version 0.9.2.8 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Advanced Custom Fields: Extended.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 0.9.2.8, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Advanced Custom Fields: Extended to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Jay.
The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to unauthorized access of data and triggering of server-side actions in all versions up to, and including, 0.9.2.7. This is due to multiple AJAX handlers registered for unauthenticated users (`wp_ajax_nopriv_*`) that fail to implement proper `current_user_can()` authorization checks. While these handlers use ACF's `acf_verify_ajax()` function to validate cryptographic nonces, the `acf_nonce` values are generated for guest users and publicly exposed in the page source of any frontend page utilizing an ACF form. This makes it possible for unauthenticated attackers to extract the guest nonce and bypass WordPress visibility permissions, leading to the unauthorized disclosure of post titles and internal Flexible Content layout structures. The vulnerability was partially patched in version 0.9.2.4.
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 Advanced Custom Fields: Extended
All 20| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.5 | Unauthenticated Sensitive Information Exposure in 'acf[<mapped_field>]' Parameter via {get_user} Template Tag Injection ≤0.9.2.7Update to 0.9.2.8 | CVE-2026-110305 | |
| Medium4.8 | Missing Authorization to Unauthenticated Arbitrary Attachment Deletion via Email Action Dynamic File Field ≤0.9.2.6Update to 0.9.2.7 | CVE-2026-10752 | |
| Critical9.8 | Unauthenticated Privilege Escalation via Account Takeover 0.9.2.7 – 0.9.2.7Update to 0.9.2.8 | CVE-2026-94268 | |
| High7.3 | Unauthenticated Arbitrary Non-Admin Account Takeover 0.9.2.7 – 0.9.2.7Update to 0.9.2.8 | CVE-2026-94262 | |
| Medium6.4 | 0.9.2.7 - Authenticated (Contributor+) Stored Cross-Site Scripting 0.8.9.4 – 0.9.2.7Update to 0.9.2.8 | CVE-2026-94264 |
- High7.5Unauthenticated Sensitive Information Exposure in 'acf[<mapped_field>]' Parameter via {get_user} Template Tag Injection
≤0.9.2.7Update to 0.9.2.8
- Medium4.8Missing Authorization to Unauthenticated Arbitrary Attachment Deletion via Email Action Dynamic File Field
≤0.9.2.6Update to 0.9.2.7
- Critical9.8Unauthenticated Privilege Escalation via Account Takeover
0.9.2.7 – 0.9.2.7Update to 0.9.2.8
- High7.3Unauthenticated Arbitrary Non-Admin Account Takeover
0.9.2.7 – 0.9.2.7Update to 0.9.2.8
- Medium6.40.9.2.7 - Authenticated (Contributor+) Stored Cross-Site Scripting
0.8.9.4 – 0.9.2.7Update to 0.9.2.8
Same weakness (Missing Authorization)
All Missing Authorization| 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 5.3
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.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.