CVE-2021-24923Public exploitNetwork attack vector

Browser script execution via unescaped statistics date

Published Jan 24, 2022 · Updated Aug 3, 2024

Reflected XSS in Brevo plugin for WordPress before 3.1.25 allows remote attackers to execute script in a victim browser via crafted statistics requests. The sib-statistics-date parameter is copied into an HTML attribute without escaping, allowing injected event-handler markup to run when a victim loads the response. Exploitation requires a victim to submit or follow the crafted statistics request, and the demonstrated impact is script execution in that browser context.

CVSS severity6.1
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Brevo plugin for WordPress before 3.1.25 allows remote attackers to execute script in a victim browser via crafted statistics requests. The sib-statistics-date parameter is copied into an HTML attribute without escaping, allowing injected event-handler markup to run when a victim loads the response. Exploitation requires a victim to submit or follow the crafted statistics request, and the demonstrated impact is script execution in that browser context.

The record

CVE
CVE-2021-24923
Published
Jan 24, 2022
Updated
Aug 3, 2024
Vendor
Brevo
Product
Brevo plugin for WordPress
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 24, 2022CVE 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=3.1.25 <3.1.25

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Brevo · Brevo plugin for WordPressversion=3.1.25 <3.1.25

Published CVSS scores

6.1WordfenceCVSS: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-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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