CVE-2021-24343Public exploitNetwork attack vector

Admin stored XSS via unsanitized APP ID

Published Jun 7, 2021 · Updated Aug 3, 2024

Cross-site scripting in iFlyChat WordPress Chat before 4.7.0 allows remote authenticated users to execute script via a crafted APP ID. The plugin stores the APP ID without sanitizing it and later emits the value into an administrative page, allowing injected markup and script to execute in a WordPress administrator's browser. Exploitation requires authenticated administrator-level access and victim interaction with the affected page; the demonstrated consequence is client-side confidentiality and integrity impact without service interruption.

CVSS severity4.8
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in iFlyChat WordPress Chat before 4.7.0 allows remote authenticated users to execute script via a crafted APP ID. The plugin stores the APP ID without sanitizing it and later emits the value into an administrative page, allowing injected markup and script to execute in a WordPress administrator's browser. Exploitation requires authenticated administrator-level access and victim interaction with the affected page; the demonstrated consequence is client-side confidentiality and integrity impact without service interruption.

The record

CVE
CVE-2021-24343
Published
Jun 7, 2021
Updated
Aug 3, 2024
Vendor
iFlyChat
Product
iFlyChat – WordPress Chat
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 7, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.7.0 <4.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

iFlyChat · iFlyChat – WordPress Chatversion=4.7.0 <4.7.0

Published CVSS scores

4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Cross-site Scripting (XSS)
T1189Drive-by Compromise

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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