CVE-2021-24543Network attack vector

Stored XSS via unsanitized settings

Published Oct 25, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in jQuery Reply to Comment through 1.31 allows remote attackers to execute script via crafted plugin settings. The settings save handler accepts Quote String and Reply String values without CSRF validation, sanitization, or output escaping before inserting them into comment markup. A logged-in administrator must visit a crafted request or affected comment, after which script runs in that administrator’s WordPress session.

CVSS severity8.8
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in jQuery Reply to Comment through 1.31 allows remote attackers to execute script via crafted plugin settings. The settings save handler accepts Quote String and Reply String values without CSRF validation, sanitization, or output escaping before inserting them into comment markup. A logged-in administrator must visit a crafted request or affected comment, after which script runs in that administrator’s WordPress session.

The record

CVE
CVE-2021-24543
Published
Oct 25, 2021
Updated
Aug 3, 2024
Vendor
Giovambattista Fazioli
Product
jQuery Reply to Comment
Classifications
CWE-79, CWE-352, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 25, 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=1.31 <=1.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Giovambattista Fazioli · jQuery Reply to Commentversion=1.31 <=1.31

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
8.8WPScanCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-352Cross-Site Request Forgery (CSRF)
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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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