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WP Maintenance Mode & Site Under Construction < 1.8.2 — Missing Authorization to Arbitrary Plugin Installation/Activation

CVE-2021-24191Published · Updated

Action summary

Affected: <1.8.2Update to 1.8.2 or newer

All remediation steps
Watch plugin
Severity
High8.8
CVSS
8.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:L Privileges required
Low
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-285 Improper Authorization
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

WP Maintenance Mode & Site Under Construction wp-maintenance-mode-site-under-construction

  1. Affected< 1.8.2
  2. Patched in1.8.2

Update to 1.8.2 or newer.

You are affected if you run < 1.8.2. Version 1.8.2 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under WP Maintenance Mode & Site Under Construction.
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 1.8.2, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch WP Maintenance Mode & Site Under Construction to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Bugbang.

Low privileged users can use the AJAX action 'cp_plugins_do_button_job_later_callback' in the WP Maintenance Mode & Site Under Construction WordPress plugin before 1.8.2, to install any plugin (including a specific version) from the WordPress repository, as well as activate arbitrary plugin from then blog, which helps attackers install vulnerable plugins and could lead to more critical vulnerabilities like RCE.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

More in WP Maintenance Mode & Site Under Construction

All 5
More vulnerabilities in WP Maintenance Mode & Site Under Construction
SeverityVulnerabilityCVEPublished
Medium4.3Cross-Site Request Forgery
≤4.3Update to 4.4
CVE-2025-49284
High8.8Cross-Site Request Forgery to Arbitrary Plugin Installation/Activation
≤1.5.2Update to 1.6
—
High8.8Improper Authorization
<1.5.2Update to 1.5.2
CVE-2021-24190
High8.8Cross-Site Request Forgery to Arbitrary Plugin Installation/Activation
≤1.8.2Update to 1.9
—

Timeline

  1. CVE published

    Severity high, CVSS 8.8

  2. 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.

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