CVE-2021-24393Public exploitNetwork attack vector

Administrator SQL injection via unescaped comment identifier

Published Sep 6, 2021 · Updated Aug 3, 2024

SQL injection in Jan Olsen Comment Highlighter 0.13 and earlier allows remote authenticated users to execute arbitrary SQL via the c parameter. The plugin inserts the raw c GET value into the comment_ID predicate of a $wpdb->get_row SELECT statement without sanitizing, escaping, validating, or parameterizing it. Administrator access is required, and successful injection can read or alter WordPress database data or interrupt database-backed operations.

CVSS severity7.2
High
EPSS probability1.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Jan Olsen Comment Highlighter 0.13 and earlier allows remote authenticated users to execute arbitrary SQL via the c parameter. The plugin inserts the raw c GET value into the comment_ID predicate of a $wpdb->get_row SELECT statement without sanitizing, escaping, validating, or parameterizing it. Administrator access is required, and successful injection can read or alter WordPress database data or interrupt database-backed operations.

The record

CVE
CVE-2021-24393
Published
Sep 6, 2021
Updated
Aug 3, 2024
Vendor
Jan Olsen
Product
Comment Highlighter
Classifications
CWE-89
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 6, 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=0.13 <=0.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Jan Olsen · Comment Highlighterversion=0.13 <=0.13

Published CVSS scores

6.5NIST NVDAV:N/AC:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

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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