CVE-2025-66370Network attack vector

Authenticated file disclosure via external entity expansion

Published Nov 28, 2025 · Updated Jan 15, 2026

XXE in ZUGFeRD invoice parsing in kivitendo before 3.9.2 allows remote authenticated users to read server files via a crafted upload. SL::XMLInvoice and SL::ZUGFeRD pass uploaded XML and embedded XMP to XML::LibXML with external entity expansion enabled. Access to invoice-upload functionality is required, and successful exploitation discloses files readable by the server process.

CVSS severity5.0
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in ZUGFeRD invoice parsing in kivitendo before 3.9.2 allows remote authenticated users to read server files via a crafted upload. SL::XMLInvoice and SL::ZUGFeRD pass uploaded XML and embedded XMP to XML::LibXML with external entity expansion enabled. Access to invoice-upload functionality is required, and successful exploitation discloses files readable by the server process.

The record

CVE
CVE-2025-66370
Published
Nov 28, 2025
Updated
Jan 15, 2026
Vendor
kivitendo GmbH
Product
kivitendo
Classifications
CWE-611, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 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 <3.9.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

kivitendo GmbH · kivitendoversion=0 <3.9.2

Published CVSS scores

5.0MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-611Improper Restriction of XML External Entity Reference
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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