CVE-2024-8726Network attack vector

Browser script execution via unescaped add_query_arg URL output

Published Nov 20, 2024 · Updated Apr 8, 2026

Reflected XSS in Mailmunch Forms for Mailchimp 3.2.3 and earlier allows remote attackers to execute scripts through crafted URLs. The plugin passes attacker-controlled query data through add_query_arg and renders the resulting URL without appropriate output escaping. Execution requires a user to open the crafted link, allowing script code to run in the affected site's browser context.

CVSS severity6.1
Medium
EPSS probability0.32%
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 Mailmunch Forms for Mailchimp 3.2.3 and earlier allows remote attackers to execute scripts through crafted URLs. The plugin passes attacker-controlled query data through add_query_arg and renders the resulting URL without appropriate output escaping. Execution requires a user to open the crafted link, allowing script code to run in the affected site's browser context.

The record

CVE
CVE-2024-8726
Published
Nov 20, 2024
Updated
Apr 8, 2026
Vendor
Mailmunch
Product
Mailmunch Forms for Mailchimp
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record 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=0 <=3.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mailmunch · Mailmunch Forms for Mailchimpversion=0 <=3.2.3

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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