CVE-2023-3136Public exploitNetwork attack vector

Stored XSS via unescaped archived email subjects

Published Aug 30, 2023 · Updated Apr 8, 2026

Stored cross-site scripting in Pierre Lannoy MailArchiver 2.10.1 and earlier allows remote attackers to run scripts via email subjects. The archive viewer inserts an attacker-controlled subject from a stored outbound email into its administrative page without output escaping. Exploitation requires another site feature, such as a public contact form, to place attacker input into an outbound email and an administrator to view the archived message; the script then runs in that user's WordPress session.

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 cross-site scripting in Pierre Lannoy MailArchiver 2.10.1 and earlier allows remote attackers to run scripts via email subjects. The archive viewer inserts an attacker-controlled subject from a stored outbound email into its administrative page without output escaping. Exploitation requires another site feature, such as a public contact form, to place attacker input into an outbound email and an administrator to view the archived message; the script then runs in that user's WordPress session.

The record

CVE
CVE-2023-3136
Published
Aug 30, 2023
Updated
Apr 8, 2026
Vendor
Pierre Lannoy
Product
MailArchiver
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 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 <=2.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pierre Lannoy · MailArchiverversion=0 <=2.10.1

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.

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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')
T1059.007Command and Scripting Interpreter: JavaScript

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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