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Similar Posts <= 3.1.5 — Admin+ Arbitrary PHP Code Execution

CVE-2021-24537Published · Updated

Action summary

Affected: ≤3.1.5Update to 3.1.6 or newer

All remediation steps
Watch plugin
Severity
High7.2
CVSS
7.2
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:H/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:H Privileges required
High
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-94 Improper Control of Generation of Code
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Similar Posts – Best Related Posts Plugin for WordPress similar-posts

  1. Affected≤ 3.1.5
  2. Patched in3.1.6

Update to 3.1.6 or newer.

You are affected if you run ≤ 3.1.5. Version 3.1.6 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Similar Posts – Best Related Posts Plugin for WordPress.
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 3.1.6, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Similar Posts – Best Related Posts Plugin for WordPress to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to bl4derunner.

The Similar Posts WordPress plugin through 3.1.5 allow high privilege users to execute arbitrary PHP code in an hardened environment (ie with DISALLOW_FILE_EDIT, DISALLOW_FILE_MODS and DISALLOW_UNFILTERED_HTML set to true) via the 'widget_rrm_similar_posts_condition' widget setting of the plugin.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

More in Similar Posts – Best Related Posts Plugin for WordPress

All 2
More vulnerabilities in Similar Posts – Best Related Posts Plugin for WordPress
SeverityVulnerabilityCVEPublished
Medium4.4Authenticated (Admin+) Stored Cross-Site Scripting
≤3.1.6No patch available
CVE-2022-41612

Timeline

  1. CVE published

    Severity high, CVSS 7.2

  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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