CVE-2021-24809Public exploitNetwork attack vector

Chat manipulation via nonce-less AJAX actions

Published Nov 1, 2021 · Updated Aug 3, 2024

CSRF in WordPlus Better Messages before 1.9.9.41 allows remote attackers to alter a logged-in user's messaging state via crafted AJAX requests. Seven wp-admin/admin-ajax.php actions for joining, leaving, muting, and changing thread membership accept state-changing POST data without validating a nonce. Exploitation requires a logged-in victim to submit an attacker-controlled request, and consequences are limited to unwanted chat and thread actions.

CVSS severity8.8
High
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in WordPlus Better Messages before 1.9.9.41 allows remote attackers to alter a logged-in user's messaging state via crafted AJAX requests. Seven wp-admin/admin-ajax.php actions for joining, leaving, muting, and changing thread membership accept state-changing POST data without validating a nonce. Exploitation requires a logged-in victim to submit an attacker-controlled request, and consequences are limited to unwanted chat and thread actions.

The record

CVE
CVE-2021-24809
Published
Nov 1, 2021
Updated
Aug 3, 2024
Vendor
WordPlus
Product
Better Messages
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 1, 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=1.9.9.41 <1.9.9.41

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WordPlus · Better Messagesversion=1.9.9.41 <1.9.9.41

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001User Execution: Malicious Link

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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