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Under Construction <= 3.85 — Authenticated Stored Cross-Site Scripting

d5df75f8-1250-4b79-a796-9146d3037becPublished · Updated

Action summary

Affected: ≤3.85Update to 3.86 or newer

All remediation steps
Watch plugin
Severity
Medium5.5
CVSS
5.5
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:H Privileges required
High
UI:N User interaction
None
S:C Scope
Changed
C:L Confidentiality
Low
I:L Integrity
Low
A:N Availability
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?

Under Construction under-construction-page

  1. Affected≤ 3.85
  2. Patched in3.86

Update to 3.86 or newer.

You are affected if you run ≤ 3.85. Version 3.86 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

  1. Update to version 3.86, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Under Construction to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Julien (atmon3r).

The Under Construction plugin for WordPress is vulnerable to Cross-Site Scripting in versions up to, and including, 3.85, that make it possible for attackers with administrative privileges to inject arbitrary web scripts via the social and connect icon fields.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

More in Under Construction

All 5
More vulnerabilities in Under Construction
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting
≤5.82Update to 5.83
CVE-2026-81295
Medium6.5Authenticated (Subscriber+) Arbitrary File Read via template_thumbnail Parameter
≤5.76Update to 5.81
CVE-2026-11426
Medium4.3Cross-Site Request Forgery via admin_action_ucp_dismiss_notice
≤3.96Update to 3.97
CVE-2023-0831
Medium4.3Cross-Site Request Forgery via admin_action_install_weglot
≤3.96Update to 3.97
CVE-2023-0832

Same weakness (Cross-Site Scripting)

All Cross-Site Scripting
Other Cross-Site Scripting vulnerabilities
SeverityVulnerabilityCVEPublished
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
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
CVE-2026-125055
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
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity medium, CVSS 5.5

  2. 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.

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