🚨 Millions of users are shaken by the Lotte Card Hack. This wasn’t some random glitch—this was a full-on data breach with sensitive customer information leaked. Here’s a complete breakdown so you’ll know what happened, how big the leak is, and what steps you must take to stay safe. 🔒
🔎 What Happened in the Lotte Card Hack
In late August 2025, Lotte Card was hit by a major cyber attack. Hackers broke into the company’s internal payment system, making this one of the biggest financial data breaches in Korea.
💻 Attack Path & Scale
Hackers exploited a vulnerability in Oracle WebLogic, planted a web shell, and pulled about 1.7GB of sensitive payment data. Media reports revealed that info of over 9.6 million customers may have leaked. 😱
⚠️ First Response by Lotte Card
Around August 26, suspicious access traces were detected, but the incident was only publicly confirmed after a Sept 1 report to the Financial Supervisory Service (FSS). This delay created a window where customer info might’ve been exposed.
📌 Past Security Incidents
Lotte Card has had security issues before: - The 2014 credit card data breach involving other banks - Fraudulent mobile payments in 2022 - Phishing and smishing scams in 2023 Regulators are now digging into the 2025 hack to determine the full impact.
📊 How Big Was the Data Leak?
The breach may have exposed up to 1.7GB of customer data, including names, card numbers, and even transaction records. With 9.6 million+ users at risk, this is one of the largest financial hacks in Korean history.
🔐 Secondary Risks
Once leaked, personal info can fuel identity theft, fraudulent transactions, or even end up on the dark web. Regulators and Lotte Card are monitoring closely to prevent resale of stolen data.
✅ What Customers Should Do
- Review your transaction history regularly
- Report any suspicious charges ASAP
- Change your passwords often
- Don’t click shady links or open random attachments
🛡️ Lotte Card & FSS Response
After detecting the hack, Lotte Card shut down compromised servers, upgraded systems, and began notifying customers. The Financial Supervisory Service (FSS) demanded customer protection measures, including compensation and system reinforcements.
👉 Visit Lotte Card Official Site
🔗 Financial Supervisory Service (FSS)
📑 Internal Findings
Lotte Card claims that no “critical personal info” has been confirmed leaked yet. But regulators are still running joint investigations to verify the full scale.
🤝 Customer Support Plans
Authorities will soon provide an online portal for customers to check abnormal transactions. Support includes reissuing cards, refunding fraudulent payments, and credit monitoring services. Lotte Card apologized and promised tighter security.
⚔️ How the Hack Went Down
Hackers exploited a known Oracle WebLogic CVE-2017-10271 vulnerability, which allowed remote code execution. Some Lotte Card servers were missing security patches, making them an easy target.
💾 Web Shell & Data Extraction
Attackers installed a malicious web shell, gained deep access, and exfiltrated up to 1.7GB of financial data. This wasn’t just a system poke—it was a direct hit on core payment infrastructure.
🔍 Security Experts’ View
Cybersecurity analysts warn this breach is massive, exposing millions. Unlike simple phishing cases, this attack directly targeted payment networks, making it one of the most severe financial data breaches in Korea.
📝 What To Do If Your Data Is Leaked
Even though Lotte Card says it’s still in the “attempt stage,” customers must act as if their data is compromised. Stay calm but move smart. The FSS will soon open a portal to check unusual activity.
🔗 Korea Internet & Security Agency (KISA) Info
🛡️ National Health Insurance Service - Credit Info Protection
📌 Check Card Transactions
Go through your card statements carefully. If you spot suspicious charges, report them immediately and consider reissuing your card.
🚫 Beware of Smishing & Phishing
Expect more smishing & phishing attempts. Don’t click on random links in texts or emails. Always verify via the official app or site.
🔑 Change Passwords & Set Alerts
Update your Lotte Card passwords and any linked online accounts. Turn on real-time alerts to catch unusual activity fast.
📊 Use Credit Monitoring
If you suspect exposure, sign up for credit monitoring services. They’ll help track suspicious activity and prevent long-term damage.
📡 SKT SIM Data Leak Connection
The Lotte Card hack overlaps in timing with the SK Telecom SIM data breach. Analysts suggest a possible chain cyberattack. If connected, this could be the largest coordinated cyberattack in Korea.
📖 Lessons from Past Cases
During the SKT breach, slow corporate response created backlash. Lotte Card must act fast, stay transparent, and rebuild customer trust.
📚 Yes24 Hack Example
Just like the Yes24 breach, success depends on quick recovery and clear communication. Experts urge Lotte Card to reissue cards proactively and publish full data leak details.
🔮 What This Hack Means for Security
The Lotte Card Hack is a wake-up call for Korea’s financial security system. With 1.7GB of data possibly stolen, this was a direct strike on payment networks, proving vulnerabilities in critical infrastructure.
🏛️ Role of Government & Regulators
The Korean government and FSS are re-checking financial systems nationwide. Investigations aim to identify attack origins, organizations, and methods.
📌 What Lotte Card Must Do
Transparency is key. Lotte Card must: - Reveal the full scope of leaked data - Offer automatic card reissues - Provide real compensation and protections
👥 Customers & Businesses Together
Customers must check usage often, enable alerts, and boost password hygiene. Companies need stronger patching, monitoring, and crisis response.
✅ Final Thoughts
The Lotte Card Hack is a stark reminder of why personal data protection matters. Not just for Lotte Card users, but for all financial customers in Korea. With quick company response + strict regulator action, hopefully we’ll never see a breach like this again.
❓ Frequently Asked Questions
📅 When did the hack first happen?
Late August 2025. That’s when Lotte Card detected unusual activity in its payment system.
💾 How much data was leaked?
Between 1.2GB and 1.7GB of data. Reports suggest up to 9.6 million customers affected.
🛡️ What should customers do?
Review statements, report suspicious charges, change passwords, and enable fraud alerts. Basically—stay on guard.
🏦 What is Lotte Card doing now?
They’re upgrading systems, cooperating with regulators, and preparing customer compensation plans.
🔍 What vulnerability was exploited?
The Oracle WebLogic CVE-2017-10271 vulnerability, which allows remote code execution if unpatched.
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