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Comcast Xfinity data breach 2023 affects 35 million customers

The Citrix Bleed flaw stirkes back with Comcast Xfinity data breach 2023 this time

byEmre Çıtak
December 20, 2023
in Cybersecurity

Comcast Xfinity data breach 2023 has been confirmed, affecting over 35 million customers. Exploiting a known vulnerability in Citrix software, hackers accessed sensitive information between October 16th and 19th, 2023.

The Citrix Bleed flaw, patched in October, had been actively exploited since August, raising concerns about Xfinity’s delayed detection.

While the full extent of stolen data at Comcast Xfinity data breach 2023 remains under investigation, confirmed breaches include:

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  • 35.8 million compromised accounts: Usernames and hashed passwords are confirmed stolen, affecting every Xfinity customer
  • Additional data at risk: For some users, names, contact details, Social Security number fragments, birthdays, and security questions may also be exposed

Adding to the anxiety, many customers report being blindsided by password reset prompts before the official breach announcement. This lack of communication fuels distrust and highlights the need for more proactive transparency.

Comcast Xfinity data breach 2023
Comcast Xfinity data breach 2023 has affected over 35 million customers (Image credit)

Comcast Xfinity data breach 2023 confirmed by the officials

Comcast Xfinity data breach 2023 was confirmed by the company with the following words on the notice:

”On October 10, 2023, Citrix announced a vulnerability in software used by Xfinity and thousands of other companies worldwide. Citrix issued additional mitigation guidance on October 23, 2023. Xfinity promptly patched and mitigated the Citrix vulnerability within its systems. However, during a routine cybersecurity exercise on October 25, Xfinity discovered suspicious activity and subsequently determined that between October 16 and October 19, 2023, there was unauthorized access to its internal systems that was concluded to be a result of this vulnerability.

Xfinity notified federal law enforcement and initiated an investigation into the nature and scope of the incident. On November 16, Xfinity determined that information was likely acquired. After additional review of the affected systems and data, Xfinity concluded on December 6, 2023, that the customer information in scope included usernames and hashed passwords; for some customers, other information may also have been included, such as names, contact information, last four digits of social security numbers, dates of birth and/or secret questions and answers. However, the data analysis is continuing”.


Are you among the 14.7 million affected by the Mr. Cooper data breach?


The timeline of a data breach is as follows:

  • October 2023: Citrix releases patches to address a critical vulnerability known as “CitrixBleed.”
    Between October 16th and 19th: Hackers exploit the vulnerability to gain unauthorized access to Xfinity’s systems
  • October 25th: Xfinity detects suspicious activity on its network
  • November 16th: Investigation confirms data exfiltration affecting over 35 million customers
  • December 6th: Xfinity concludes that stolen data includes usernames and hashed passwords. Additional information like names, contact details, and partial Social Security numbers may have also been compromised for some customers

This isn’t Xfinity’s first rodeo. Last year, the company faced criticism for credential stuffing attacks that bypassed two-factor authentication, compromising accounts and fueling cryptocurrency exchange fraud.

Comcast Xfinity data breach 2023
 Hackers exploited a known vulnerability in Citrix software to perform the Comcast Xfinity data breach 2023 (Image credit)

The Comcast Xfinity data breach 2023 raises several critical questions:

  • Did Xfinity prioritize timely patching of the Citrix vulnerability?
  • What specific security measures failed to prevent the breach?
  • How will Xfinity regain customer trust and prevent future incidents?

While Xfinity claims no evidence of leaked data or ransom demands, the potential for harm remains enormous. Millions now face increased risks of phishing scams, identity theft, and financial fraud.

What if you are affected by Comcast Xfinity data breach 2023?

If you’re an Xfinity customer, the 2023 data breach is a cause for concern, but there are steps you can take to minimize the potential damage:

  • Change your Xfinity password: Even if you didn’t receive a reset prompt, go ahead and update your password using a strong, unique one that you don’t use for any other accounts
  • Enable two-factor authentication (2FA): This adds an extra layer of security by requiring a second factor, like a code from your phone, to log in
  • Be vigilant about phishing scams: Hackers may try to take advantage of the breach by sending emails or texts pretending to be Xfinity asking for your information. Never click on any links or provide personal information unless you’re sure it’s legitimate
  • Monitor your accounts: Keep an eye on your bank statements, credit reports, and any other accounts linked to your Xfinity information for any suspicious activity

Featured image credit: Fili Santillán/Unsplash.

Tags: ComcastData Breach

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