BERLIN, GERMANY - JUNE 22: In this photo Illustration hands typing on a computer keyboard on June 22, 2016 in Berlin, Germany. (Photo Illustration by Thomas Trutschel/Photothek via Getty Images)
BERLIN, GERMANY - JUNE 22: In this photo Illustration hands typing on a computer keyboard on June 22, 2016 in Berlin, Germany. (Photo Illustration by Thomas Trutschel/Photothek via Getty Images)
PHOTO: Thomas Trutschel/Photothek/Photothek via Getty Images
Now playing
01:43
5 of the biggest data breaches​
WASHINGTON, DC - JUNE 22: Facebook
WASHINGTON, DC - JUNE 22: Facebook's Chief Operating Officer Sheryl Sandberg speaks with AEI president Arthur C. Brooks during a public conversation on Facebook's work on 'breakthrough innovations that seek to open up the world' at The American Enterprise Institute for Public Policy Research on June 22, 2016 in Washington, DC. (Photo by Allison Shelley/Getty Images)
PHOTO: Allison Shelley/Getty Images North America/Getty Images
Now playing
01:23
Hear Sandberg downplay Facebook's role in the Capitol riots
screengrab US social media
screengrab US social media
PHOTO: Getty Images
Now playing
04:35
Tech companies ban Trump, but not other problematic leaders
PHOTO: Samsung
Now playing
01:53
See Samsung's new Galaxy S21 lineup
PHOTO: CNN
Now playing
02:47
Extremists and conspiracy theorists search for new platforms online
This illustration picture shows the social media website from Parler displayed on a computer screen in Arlington, Virginia on July 2, 2020. - Amid rising turmoil in social media, recently formed social network Parler is gaining with prominent political conservatives who claim their voices are being silenced by Silicon Valley giants. Parler, founded in Nevada in 2018, bills itself as an alternative to "ideological suppression" at other social networks. (Photo by Olivier Douliery/AFP/Getty Images)
This illustration picture shows the social media website from Parler displayed on a computer screen in Arlington, Virginia on July 2, 2020. - Amid rising turmoil in social media, recently formed social network Parler is gaining with prominent political conservatives who claim their voices are being silenced by Silicon Valley giants. Parler, founded in Nevada in 2018, bills itself as an alternative to "ideological suppression" at other social networks. (Photo by Olivier Douliery/AFP/Getty Images)
PHOTO: Olivier Douliery/AFP/Getty Images
Now playing
03:49
Parler sues Amazon in response to being deplatformed
PHOTO: Twitter
Now playing
02:39
Twitter permanently suspends Donald Trump from platform
Panasonic
Panasonic's Augmented Reality Heads-up Display
PHOTO: Panasonic USA
Now playing
01:06
This tech gives drivers directions on the road in front of them
PHOTO: LG Display
Now playing
01:10
See LG's transparent TV
PHOTO: Twitter/@gregdoesthings
Now playing
02:06
Internet gets creative with empty iPhone boxes
NEW YORK, NY - JUNE 3: The Google logo adorns the outside of their NYC office Google Building 8510 at 85 10th Ave on June 3, 2019 in New York City. Shares of Google parent company Alphabet were down over six percent on Monday, following news reports that the U.S. Department of Justice is preparing to launch an anti-trust investigation aimed at Google. (Photo by Drew Angerer/Getty Images)
NEW YORK, NY - JUNE 3: The Google logo adorns the outside of their NYC office Google Building 8510 at 85 10th Ave on June 3, 2019 in New York City. Shares of Google parent company Alphabet were down over six percent on Monday, following news reports that the U.S. Department of Justice is preparing to launch an anti-trust investigation aimed at Google. (Photo by Drew Angerer/Getty Images)
PHOTO: Drew Angerer/Getty Images North America/Getty Images
Now playing
03:25
Google employee on unionizing: Google can't fire us all
Now playing
02:01
Watch 'deepfake' Queen deliver alternative Christmas speech
Now playing
01:42
Watch father leave daughter dozens of surprise Ring messages
PHOTO: Photo Illustration: Kena Betancur/Getty Images
Now playing
04:50
Zoom's founder says he 'let down' customers. Here's why
Now playing
00:48
See Walmart's self-driving delivery trucks in action
Now playing
01:25
This robotaxi from Amazon's Zoox has no reverse function
(CNN Business) —  

DoorDash confirmed it suffered a data breach affecting roughly 4.9 million delivery people and merchants.

In a blog post on Thursday, DoorDash said it noticed unusual activity from a third-party service provider earlier in September. After investigating the activity, it found an unauthorized third party was able to access DoorDash user data on May 4, 2019. DoorDash said it took immediate steps to block further access and improve security.

The people affected joined DoorDash on or before April 5, 2018 — people who joined after that date weren’t affected, according to the blog post. The company said it will be notifying those who were.

The breach involved data such as names, email addresses, delivery addresses, order history, phone numbers and encrypted versions of passwords. In some instances, the last four digits of payment cards and bank account numbers were accessed. According to the blog post, full payment card and bank account information weren’t compromised. The driver’s license numbers of about 100,000 delivery people were also accessed.

In response to the breach, DoorDash said it has added more security layers to protect people’s data and improved the security protocols required to gain access to this data.

DoorDash encouraged people to change their passwords, even if they weren’t affected but were still concerned about the safety of their accounts.