Confidence HighJan 6, 2025phonemondo.de

PhoneMondo Data Leak: Over 10.5 Million Records Appear on Dark Web

PatternExternal actor · Hacking · Confidentiality impact

More than 10.5 million records stolen from the German telecommunication platform PhoneMondo appeared on the dark web on January 6, 2025. The cyberattack, discovered on January 2, 2025, by Scavix Software GmbH & Co. KG (PhoneMondo's developer), involved unauthorized access to a database in a test environment. The leaked sensitive data included names, birth dates, addresses, phone numbers, email addresses, usernames, passwords, and IBANs. While the production environment was reportedly unaffected, data from the usage history was compromised.

Signal date

Jan 6, 2025

Updated

Jul 1, 2026

Confidence

High

Sources

2 sources

Phonemondo

Domain: phonemondo.de
Sector: Information
Signals: 1 linked

Scan this company

Signal context

First seen: Jan 6, 2025

Last updated: Jul 1, 2026

Status: Public signal

Key points

Over 10.5 million records stolen from PhoneMondo appeared on the dark web on January 6, 2025.
Cyberattack discovered on January 2, 2025.
Attackers gained unauthorized access to a database in a test environment.

Signal analysis

Beta

This analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.

Affected organization

Phonemondo

Sector: Information

Likely country: 🇩🇪 Germany

inferred from company domain

Estimated

Threat source

Hacking, Error activity

Watch internet-facing systems, credential abuse and exploit activity.

Source type: outside the affected organization

Business impact

Potential data exposure

Impact area: Confidentiality

Likely asset: User or customer data, Server or cloud data store

Trend context

79 signals with similar action pattern

23 signals in the same sector
88 signals with the same likely impact area
1 signal linked to this organization/domain

Mentioned entities

PhonemondoData DisclosureOverDark Web MoreGermanPhoneMondoScavix Software GmbHIBANs. While theCyberattackAttackers

External sources

Related signals

Grouped by why the signal is relevant.

AivdJul 1, 2026

Same sectorSame action patternSame impact area

CTIVD: AIVD en MIVD verwerken persoonsgegevens in bulkdata onrechtmatig

The Dutch intelligence services, AIVD and MIVD, have unlawfully processed personal data in bulk datasets, according to a ruling by the Committee for the Supervision of the Intelligence and Security Services (CTIVD). The report, published on July 1, 2026, states that groups of employees had unauthorized access to personal data, and large quantities of data were stored for too long. The bulk datasets, sometimes containing millions of records, include names, phone numbers, location data, social media data, and communication content, sourced from government agencies, commercially available datasets, or stolen datasets offered by criminals. The CTIVD has issued thirteen recommendations to improve the situation.

CtcJun 28, 2026

Same sectorSame action patternSame impact area

Chubu Telecommunications C., Inc. Affected by KDDI Corporation Data Breach

Chubu Telecommunications C., Inc., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. Chubu Telecommunications customers' email addresses and passwords may have been compromised.

BiglobeJun 28, 2026

Same sectorSame action patternSame impact area

BIGLOBE Inc. Affected by KDDI Corporation Data Breach

BIGLOBE Inc., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. BIGLOBE Inc. customers' email addresses and passwords may have been compromised.

StnetJun 28, 2026

Same sectorSame action patternSame impact area

STNet, Inc. Affected by KDDI Corporation Data Breach

STNet, Inc., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. STNet customers' email addresses and passwords may have been compromised.

JcomJun 28, 2026

Same sectorSame action patternSame impact area

JCOM Co., Ltd. Affected by KDDI Corporation Data Breach

JCOM Co., Ltd., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. JCOM customers' email addresses and passwords may have been compromised.

NiftyJun 28, 2026

Same sectorSame action patternSame impact area

NIFTY Corporation Affected by KDDI Corporation Data Breach

NIFTY Corporation, a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. NIFTY Corporation customers' email addresses and passwords may have been compromised.