CVE-2021-24537Public exploitNetwork attack vector

Administrator PHP execution via widget condition setting

Published Nov 8, 2021 · Updated Aug 3, 2024

Code injection in Shareaholic Similar Posts 3.1.5 and earlier allows remote authenticated users to execute arbitrary PHP via a widget setting. The plugin treats the widget_rrm_similar_posts_condition value as executable PHP rather than validating it as configuration data. Administrator-level access to the Widgets interface is required, but the code executes even when WordPress file editing, file modification, and unfiltered HTML are disabled.

CVSS severity7.2
High
EPSS probability1.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Shareaholic Similar Posts 3.1.5 and earlier allows remote authenticated users to execute arbitrary PHP via a widget setting. The plugin treats the widget_rrm_similar_posts_condition value as executable PHP rather than validating it as configuration data. Administrator-level access to the Widgets interface is required, but the code executes even when WordPress file editing, file modification, and unfiltered HTML are disabled.

The record

CVE
CVE-2021-24537
Published
Nov 8, 2021
Updated
Aug 3, 2024
Vendor
Shareaholic
Product
Similar Posts
Classifications
CWE-94, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.1.5 <=3.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Shareaholic · Similar Postsversion=3.1.5 <=3.1.5

Published CVSS scores

6.0NIST NVDAV:N/AC:M/Au:S/C:P/I:P/A:P
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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