CVE-2025-34408Network attack vector

Script execution via unsanitized Added parameter

Published Dec 9, 2025 · Updated May 14, 2026

Reflected XSS in MailEnable before 10.54 allows remote attackers to execute scripts in a victim's browser through the Added parameter. The /Mondo/lang/sys/Forms/MAI/AddRecipientsResult.aspx handler reflects the GET value without sanitization, so closing a list element permits arbitrary script insertion. A victim must visit a crafted link; execution can read non-HttpOnly cookies, alter rendered content, redirect the browser, or act with the victim's session.

CVSS severity5.3
Medium
EPSS probability0.49%
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 MailEnable before 10.54 allows remote attackers to execute scripts in a victim's browser through the Added parameter. The /Mondo/lang/sys/Forms/MAI/AddRecipientsResult.aspx handler reflects the GET value without sanitization, so closing a list element permits arbitrary script insertion. A victim must visit a crafted link; execution can read non-HttpOnly cookies, alter rendered content, redirect the browser, or act with the victim's session.

The record

CVE
CVE-2025-34408
Published
Dec 9, 2025
Updated
May 14, 2026
Vendor
MailEnable
Product
MailEnable
Classifications
CWE-79, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. May 14, 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 <10.54

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MailEnable · MailEnableversion=0 <10.54

Published CVSS scores

5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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 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')
T1566.002Spearphishing Link

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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