CVE-2023-3135Network attack vector

Unauthenticated stored XSS via unescaped email subjects

Published Jul 12, 2023 · Updated Apr 8, 2026

Stored XSS in oacstudio Mailtree Log Mail 1.0.0 and earlier allows remote attackers to run scripts through a crafted email subject. The plugin stores wp_mail() subjects and renders the saved subject in its log interface without sufficient sanitization or output escaping. An unauthenticated sender must cause WordPress to log the crafted subject; the script runs when a user views the affected log entry.

CVSS severity7.2
High
EPSS probability0.46%
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 oacstudio Mailtree Log Mail 1.0.0 and earlier allows remote attackers to run scripts through a crafted email subject. The plugin stores wp_mail() subjects and renders the saved subject in its log interface without sufficient sanitization or output escaping. An unauthenticated sender must cause WordPress to log the crafted subject; the script runs when a user views the affected log entry.

The record

CVE
CVE-2023-3135
Published
Jul 12, 2023
Updated
Apr 8, 2026
Vendor
oacstudio
Product
Mailtree Log Mail
Classifications
CWE-79, T1059.007
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 <=1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

oacstudio · Mailtree Log Mailversion=0 <=1.0.0

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
6.1NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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