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Government Data Breaches

Federal agencies, state governments, municipalities, and public-sector contractors have become priority targets for nation-state actors and ransomware groups. Below is every government-sector breach LeakTrace has indexed.

98B+
Records Exposed
582
Incidents
94+
Countries
+104%
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Government Data Breaches (582 indexed)

medium · government · May 1, 2026

Unprecedented

Tyler Bridegan, Scott Hyman, Patrick Strubbe, and Sarah Wilk of Womble Bond Dickinson write: In a first of its kind, a California federal judge allowed claims against Bain Capital to proceed based on a data breach at its

View incident → Original disclosure Indexed 1 day, 1 hour ago
medium · government · Apr 26, 2026

KR: Data of 100,000 leaked

Oh Seok-min reports: Personal information of around 100,000 customers has been leaked from a golf course, prompting a police investigation, sources said Sunday. The Korean National Police Agency is probing the case after

View incident → Original disclosure Indexed 6 days, 1 hour ago
medium · government · Apr 23, 2026

UK’s NCSC calls passkeys the

The UK’s National Cyber Security Centre (NCSC) is recommending passkeys as the default authentication method for businesses to offer consumers, citing industry progress that now makes them a more secure and user-friendly

View incident → Original disclosure Indexed 1 week, 2 days ago
medium · government · Apr 23, 2026

Claude Mythos signals a new

The Claude Mythos Preview appears to be living up to the hype, at least from a cybersecurity standpoint. The model, which Anthropic rolled out to a small group of users, including Firefox developer Mozilla, earlier this

View incident → Original disclosure Indexed 1 week, 2 days ago
critical · government · Apr 21, 2026

French govt agency

France Titres, the government agency in France for issuing and managince administrative documents has disclosed a data breach after a threat actor claimed the attack and stealing citizen data. [...]

View incident → Original disclosure Indexed 1 week, 4 days ago
medium · government · Apr 16, 2026

Defendant Sentenced To Prison For

Not everyone complies with the conditions of pre-sentencing release. After pleading guilty to a credential stuffing attack, this defendant reopened his online criminal shop and advertised what he was doing. Unsurprisingl

View incident → Original disclosure Indexed 2 weeks, 2 days ago
critical · government · Apr 16, 2026

Double trouble

Kenna Hughes-Castleberry reports: Nine Mexican government agencies were hacked in an artificial intelligence (AI)-driven cyber campaign between December 2025 and mid-February 2026 in what researchers have said should &#8

View incident → Original disclosure Indexed 2 weeks, 2 days ago
medium · government · Apr 15, 2026

Sweden Blames Pro-Russian Group for

In what was Sweden’s first public mention of the attack, the country’s minister for civil defense said it targeted a heating plant in western Sweden. The post Sweden Blames Pro-Russian Group for Cyberattack Last Year on

View incident → Original disclosure Indexed 2 weeks, 3 days ago
medium · government · Apr 10, 2026

UK says it

A Russian attack submarine and vessels from the country’s Main Directorate of Deep Sea Research (GUGI) were involved in what the UK Ministry of Defence called “nefarious activity over critical undersea infrastructure els

View incident → Original disclosure Indexed 3 weeks, 1 day ago
critical · government · Apr 10, 2026

Hacker Unknown now known, named

German police have pinned a name to one of the world’s most notorious hackers. Danii Shchukin operated under the names of UNKN or Unknown and GandCrab and was, according to German police, the leader of one of the largest

View incident → Original disclosure Indexed 3 weeks, 1 day ago
medium · government · Apr 9, 2026

A hacker has allegedly

Isaac Yee reports: A hacker has allegedly stolen a massive trove of sensitive data – including highly classified defense documents and missile schematics – from a state-run Chinese supercomputer in what could potentially

View incident → Original disclosure Indexed 3 weeks, 2 days ago
medium · government · Apr 7, 2026

Russia Hacked Routers to Steal

Hackers linked to Russia's military intelligence units are using known flaws in older Internet routers to mass harvest authentication tokens from Microsoft Office users, security experts warned today. The spying campaign

View incident → Original disclosure Indexed 3 weeks, 4 days ago