CVE-2023-3167Network attack vector

Stored XSS via unescaped email subjects

Published Jul 12, 2023 · Updated Apr 8, 2026

Stored XSS in WDM Mail Queue 1.1 and earlier allows remote attackers to store scripts through crafted email subjects. The plugin stores wp_mail() subject data in its queue and renders the subject on a WordPress administration page without sufficient sanitization or output escaping. No authentication is required to supply the subject through a site feature that sends email, but script execution occurs only when a user opens the affected queue page.

CVSS severity7.2
High
EPSS probability0.44%
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 WDM Mail Queue 1.1 and earlier allows remote attackers to store scripts through crafted email subjects. The plugin stores wp_mail() subject data in its queue and renders the subject on a WordPress administration page without sufficient sanitization or output escaping. No authentication is required to supply the subject through a site feature that sends email, but script execution occurs only when a user opens the affected queue page.

The record

CVE
CVE-2023-3167
Published
Jul 12, 2023
Updated
Apr 8, 2026
Vendor
WDM
Product
Mail Queue
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 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 <=1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WDM · Mail Queueversion=0 <=1.1

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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 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')
T1190Exploit Public-Facing Application

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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