CVE-2021-24874Public exploitNetwork attack vector

Administrator-session script execution via unescaped form parameters

Published Feb 14, 2022 · Updated Aug 3, 2024

Reflected XSS in the Brevo plugin for WordPress before 3.1.31 allows remote attackers to execute script in an administrator's browser. The administrative form editor writes the lang and pid request parameters into HTML attributes without output escaping. Exploitation requires an authenticated administrator to open a crafted wp-admin form-edit URL, exposing that browser session to unauthorized data access or actions permitted by the administrator's WordPress privileges.

CVSS severity6.1
Medium
EPSS probability0.80%
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 the Brevo plugin for WordPress before 3.1.31 allows remote attackers to execute script in an administrator's browser. The administrative form editor writes the lang and pid request parameters into HTML attributes without output escaping. Exploitation requires an authenticated administrator to open a crafted wp-admin form-edit URL, exposing that browser session to unauthorized data access or actions permitted by the administrator's WordPress privileges.

The record

CVE
CVE-2021-24874
Published
Feb 14, 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. Feb 14, 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=3.1.31 <3.1.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Brevo · Brevo plugin for WordPressversion=3.1.31 <3.1.31

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/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
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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