UPDATE: False alarm:
After saying on Wednesday that it had experienced an attempted hack into its voter database, the Democratic National Committee backtracked late Wednesday night, calling the actions a "test."
The DNC said in a statement that it now believes a phishing attempt that was part of an unauthorized test on its VoteBuilder system was performed by a third-party.
Turns out the Michigan Democratic Party hired a group to test its readiness to identify spear phishing attempts and didn't tell anyone. The DNC is making changes in response.
“If any entity that wants to do something more advanced than hiring a phishing company to do training, they’re going to have to notify us," [DNC Chief Security Officer Bob] Lord said.
(...)
Brandon Dillon, the chairman of the Michigan Democratic Party, acknowledged that his team had been behind the incident.
"In an abundance of caution, our digital partners ran tests that followed extensive training," Dillon said in a statement. "Despite our misstep and the alarms that were set off, it’s most important that all of the security systems in place worked."
Alicia Rockmore, the co-executive director of DigiDems, confirmed that her group “ran tests on the Michigan state party campaign’s internal security measures which tripped an external alarm.”
DNC now says earlier attempt to hack voter database an unauthorized phishing 'test' (ABC News)
DNC security chief: We're making changes after false alarm over thwarted hack (Politico)
An unidentified party attempted to access the Democratic National Committee's national database that "houses information on tens of millions of voters across the country," and the FBI is investigating.
CNN:
The DNC was alerted in the early hours of Tuesday morning by a cloud service provider and a security research firm that a fake login page had been created in an attempt to gather usernames and passwords that would allow access to the party's database, the source said.
The page was designed to look like the access page Democratic Party officials and campaigns across the country use to log into a service called Votebuilder, which hosts the database, the source said, adding the DNC believed it was designed to trick people into handing over their login details.
(...)
The DNC's chief security officer Bob Lord, a former Yahoo! executive, briefed Democrats on the attempted attack at a meeting of the Association of State Democratic Committees in Chicago on Wednesday.
"These threats are serious and that's why it's critical that we all work together, but we can't do this alone. We need the (Trump) administration to take more aggressive steps to protect our voting systems. It is their responsibility to protect our democracy from these types of attacks," Lord said in a statement to CNN.
DNC calls FBI after detecting attempt to hack its voter database (CNN)
Democratic official: DNC stopped hack attempt of voter file (AP)