UnderConstructionPage PRO <= 5.76 — Authenticated (Subscriber+) Arbitrary File Read via template_thumbnail Parameter
CVE-2026-11426Published · Updated Action summary
Affected: ≤5.76Update to 5.81 or newer
All remediation steps- Severity
- Medium6.5
- CVSS
- 6.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:NIntegrity- None
A:NAvailability- None
- Weakness
- CWE-22 Path Traversal
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Under Construction under-construction-page
- Affected≤ 5.76
- Patched in5.81
Update to 5.81 or newer.
You are affected if you run ≤ 5.76. Version 5.81 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Under Construction.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 5.81, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Under Construction to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Nguyen Ngoc Duc (duc193).
The UnderConstructionPage PRO plugin for WordPress is vulnerable to Arbitrary File Read in all versions up to, and including, 5.76. This is due to the plugin accepting arbitrary local file paths in the template_thumbnail parameter and copying their contents into a publicly accessible uploads file. This makes it possible for authenticated attackers, with Subscriber-level access and above, to read arbitrary files on the server, which can contain sensitive information.
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 Under Construction
All 5| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤5.82Update to 5.83 | CVE-2026-81295 | |
| Medium4.3 | Cross-Site Request Forgery via admin_action_ucp_dismiss_notice ≤3.96Update to 3.97 | CVE-2023-0831 | |
| Medium4.3 | Cross-Site Request Forgery via admin_action_install_weglot ≤3.96Update to 3.97 | CVE-2023-0832 | |
| Medium5.5 | Authenticated Stored Cross-Site Scripting ≤3.85Update to 3.86 | — |
- High7.2Unauthenticated Stored Cross-Site Scripting
≤5.82Update to 5.83
- Medium4.3Cross-Site Request Forgery via admin_action_ucp_dismiss_notice
≤3.96Update to 3.97
- Medium4.3Cross-Site Request Forgery via admin_action_install_weglot
≤3.96Update to 3.97
- Medium5.5Authenticated Stored Cross-Site Scripting
≤3.85Update to 3.86
Same weakness (Path Traversal)
All Path Traversal| 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 6.5
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.