Privacy

Twitter fixes security bug that exposed at least 5.4 million accounts

Comment

The Twitter Inc. logo and signage is displayed on the facade of the company's headquarters in San Francisco, California, U.S., on Friday, Sept. 13, 2013. The San Francisco-based company filed confidentially with the U.S. Securities and Exchange Commission through a process that will keep sales and profit data under wraps until shortly before a road show to market to investors Photographer: David Paul Morris/Bloomberg
Image Credits: David Paul Morris (opens in a new window) / Getty Images

Twitter says it has fixed a security vulnerability that allowed threat actors to compile information of 5.4 million Twitter accounts, which were listed for sale on a known cybercrime forum.

The vulnerability allowed anyone to enter a phone number or an email address of a known user and learn if it was tied to an existing Twitter account, potentially exposing the identities of pseudonymous accounts.

In a brief statement published Friday, the microblogging giant said, “if someone submitted an email address or phone number to Twitter’s systems, Twitter’s systems would tell the person what Twitter account the submitted email addresses or phone number was associated with, if any.”

Twitter said it fixed the bug in January — six months after the bug was initially introduced to its codebase — after a bug bounty report by a security researcher, who was awarded $6,000 for disclosing the vulnerability.

According to the bug bounty report, the vulnerability posed a “serious threat” to users who have private or pseudonymous accounts, and could be used to “create a database” or enumerate “a big chunk of the Twitter user base.” It’s similar to a vulnerability discovered in late 2019 that allowed a security researcher to match 17 million phone numbers to Twitter accounts.

But the researcher’s warning came too late. Hackers had already exploited the vulnerability during that six-month window to create a database of email addresses and phone numbers of 5.4 million Twitter accounts.

Twitter said it learned about the exploitation from an unspecified press report in July, which found a listing on a cybercrime forum claiming to have user data “from celebrities to companies,” and OGs, referring to custom or highly sought-after social media and gaming usernames.

“After reviewing a sample of the available data for sale, we confirmed that a bad actor had taken advantage of the issue before it was addressed,” Twitter said. “We will be directly notifying the account owners we can confirm were affected by this issue.”

It’s the latest security incident to hit Twitter in recent years. In May, Twitter agreed to pay $150 million in a settlement with the Federal Trade Commission after the company misused phone numbers and email addresses, which users submitted for setting up two-factor authentication, for targeted advertising.

Twitter says Android security bug gave access to direct messages

More TechCrunch

Scale AI, a company that provides data-labeling services for training machine learning models, has raised a $1 billion Series F round from a slew of big-name institutional and corporate investors…

Data-labeling startup Scale AI raises $1B as valuation doubles to $13.8B

The new coalition, Tech Against Scams, will work together to find ways to fight back against the tools used by scammers and to better educate the public against financial scams.

Meta, Match, Coinbase and others team up to fight online fraud and crypto scams

It’s a wrap: European Union lawmakers have given the final approval to set up the bloc’s flagship, risk-based regulations for artificial intelligence.

EU Council gives final nod to set up risk-based regulations for AI

London-based fintech Vitesse has closed a $93 million Series C round of funding led by investment giant KKR.

Vitesse, a payments and treasury management platform for insurers, raises $93M to fuel US expansion

Zen Educate, an online marketplace that connects schools with teachers, has raised $37 million in a Series B round of funding. The raise comes amid a growing teacher shortage crisis…

Zen Educate raises $37M and acquires Aquinas Education as it tries to address the teacher shortage

“When I heard the released demo, I was shocked, angered and in disbelief that Mr. Altman would pursue a voice that sounded so eerily similar to mine.”

Scarlett Johansson says that OpenAI approached her to use her voice

A new self-driving truck — manufactured by Volvo and loaded with autonomous vehicle tech developed by Aurora Innovation — could be on public highways as early as this summer.  The…

Aurora and Volvo unveil self-driving truck designed for a driverless future

The European venture capital firm raised its fourth fund as fund as climate tech “comes of age.”

ETF Partners raises €285M for climate startups that will be effective quickly — not 20 years down the road

Copilot, Microsoft’s brand of generative AI, will soon be far more deeply integrated into the Windows 11 experience.

Microsoft wants to make Windows an AI operating system, launches Copilot+ PCs

Hello and welcome back to TechCrunch Space. For those who haven’t heard, the first crewed launch of Boeing’s Starliner capsule has been pushed back yet again to no earlier than…

TechCrunch Space: Star(side)liner

When I attended Automate in Chicago a few weeks back, multiple people thanked me for TechCrunch’s semi-regular robotics job report. It’s always edifying to get that feedback in person. While…

These 81 robotics companies are hiring

The top vehicle safety regulator in the U.S. has launched a formal probe into an April crash involving the all-electric VinFast VF8 SUV that claimed the lives of a family…

VinFast crash that killed family of four now under federal investigation

When putting a video portal in a public park in the middle of New York City, some inappropriate behavior will likely occur. The Portal, the vision of Lithuanian artist and…

NYC-Dublin real-time video portal reopens with some fixes to prevent inappropriate behavior

Longtime New York-based seed investor, Contour Venture Partners, is making progress on its latest flagship fund after lowering its target. The firm closed on $42 million, raised from 64 backers,…

Contour Venture Partners, an early investor in Datadog and Movable Ink, lowers the target for its fifth fund

Meta’s Oversight Board has now extended its scope to include the company’s newest platform, Instagram Threads, and has begun hearing cases from Threads.

Meta’s Oversight Board takes its first Threads case

The company says it’s refocusing and prioritizing fewer initiatives that will have the biggest impact on customers and add value to the business.

SeekOut, a recruiting startup last valued at $1.2 billion, lays off 30% of its workforce

The U.K.’s self-proclaimed “world-leading” regulations for self-driving cars are now official, after the Automated Vehicles (AV) Act received royal assent — the final rubber stamp any legislation must go through…

UK’s autonomous vehicle legislation becomes law, paving the way for first driverless cars by 2026

ChatGPT, OpenAI’s text-generating AI chatbot, has taken the world by storm. What started as a tool to hyper-charge productivity through writing essays and code with short text prompts has evolved…

ChatGPT: Everything you need to know about the AI-powered chatbot

SoLo Funds CEO Travis Holoway: “Regulators seem driven by press releases when they should be motivated by true consumer protection and empowering equitable solutions.”

Fintech lender SoLo Funds is being sued again by the government over its lending practices

Hard tech startups generate a lot of buzz, but there’s a growing cohort of companies building digital tools squarely focused on making hard tech development faster, more efficient and —…

Rollup wants to be the hardware engineer’s workhorse

TechCrunch Disrupt 2024 is not just about groundbreaking innovations, insightful panels, and visionary speakers — it’s also about listening to YOU, the audience, and what you feel is top of…

Disrupt Audience Choice vote closes Friday

Google says the new SDK would help Google expand on its core mission of connecting the right audience to the right content at the right time.

Google is launching a new Android feature to drive users back into their installed apps

Jolla has taken the official wraps off the first version of its personal server-based AI assistant in the making. The reborn startup is building a privacy-focused AI device — aka…

Jolla debuts privacy-focused AI hardware

The ChatGPT mobile app’s net revenue first jumped 22% on the day of the GPT-4o launch and continued to grow in the following days.

ChatGPT’s mobile app revenue saw its biggest spike yet following GPT-4o launch

Dating app maker Bumble has acquired Geneva, an online platform built around forming real-world groups and clubs. The company said that the deal is designed to help it expand its…

Bumble buys community building app Geneva to expand further into friendships

CyberArk — one of the army of larger security companies founded out of Israel — is acquiring Venafi, a specialist in machine identity, for $1.54 billion. 

CyberArk snaps up Venafi for $1.54B to ramp up in machine-to-machine security

Founder-market fit is one of the most crucial factors in a startup’s success, and operators (someone involved in the day-to-day operations of a startup) turned founders have an almost unfair advantage…

OpenseedVC, which backs operators in Africa and Europe starting their companies, reaches first close of $10M fund

A Singapore High Court has effectively approved Pine Labs’ request to shift its operations to India.

Pine Labs gets Singapore court approval to shift base to India

The AI Safety Institute, a U.K. body that aims to assess and address risks in AI platforms, has said it will open a second location in San Francisco. 

UK opens office in San Francisco to tackle AI risk

Companies are always looking for an edge, and searching for ways to encourage their employees to innovate. One way to do that is by running an internal hackathon around a…

Why companies are turning to internal hackathons