CVE-2023-1844Network attack vector

Author-level arbitrary email sending via unchecked action

Published Jun 28, 2023 · Updated Apr 8, 2026

Missing authorization in HappyMonster Subscribe2 10.40 and earlier allows remote authenticated users to send arbitrary email to site users. The mail branch in admin/send-email.php processed the s2_admin=mail POST action, attacker-controlled content, and uploaded attachments without a manage_options capability check. Author-level access is required, and successful exploitation sends chosen messages and files to the site's subscribers.

CVSS severity4.3
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in HappyMonster Subscribe2 10.40 and earlier allows remote authenticated users to send arbitrary email to site users. The mail branch in admin/send-email.php processed the s2_admin=mail POST action, attacker-controlled content, and uploaded attachments without a manage_options capability check. Author-level access is required, and successful exploitation sends chosen messages and files to the site's subscribers.

The record

CVE
CVE-2023-1844
Published
Jun 28, 2023
Updated
Apr 8, 2026
Vendor
HappyMonster
Product
Subscribe2
Classifications
CWE-862, T1566.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 28, 2023CVE 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 <=10.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HappyMonster · Subscribe2version=0 <=10.40

Published CVSS scores

4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1566.001Phishing: Spearphishing Attachment

Public exploit references

No public exploit references are available in this record.

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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