CVE-2021-24135Public exploitNetwork attack vector

Unauthenticated stored XSS via unencoded review fields

Published Mar 18, 2021 · Updated Aug 3, 2024

Stored XSS in WP Customer Reviews before 3.4.3 allows remote attackers to inject JavaScript through public review forms. The plugin accepts Reviewer Name, Website, and Review Title values without validation or output encoding and stores them for display. No account is required when reviews are enabled on a page; the payload executes when an administrator opens the review detail page.

CVSS severity6.1
Medium
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in WP Customer Reviews before 3.4.3 allows remote attackers to inject JavaScript through public review forms. The plugin accepts Reviewer Name, Website, and Review Title values without validation or output encoding and stores them for display. No account is required when reviews are enabled on a page; the payload executes when an administrator opens the review detail page.

The record

CVE
CVE-2021-24135
Published
Mar 18, 2021
Updated
Aug 3, 2024
Vendor
GoWeb Solutions
Product
WP Customer Reviews
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 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=3.4.3 <3.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GoWeb Solutions · WP Customer Reviewsversion=3.4.3 <3.4.3

Published CVSS scores

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

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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