Cloud-based collaboration software company Atlassian has blamed a maintenance script update for a lengthy partial outage.

The outage began on early April 5 and is still ongoing. Jira Software, Jira Work Management, Jira Service Management, Confluence, Opsgenie Cloud, Statuspage, and Atlassian Access continue to be down for some customers.

Around 400 customers cannot use any of the services, a small fraction of its 226,000 customer-base. There my be others with partial access issues.

"While conducting maintenance, a script action resulted in a small number of our customers being unable to access their products," an Atlassian spokesperson told ZDNet.

"We can confirm this incident was not the result of a cyberattack and there has been no unauthorized access to customer data.

"We know our customers rely on our products to get their work done, and we are sorry for the disruption this causes."

The company said in a tweet that it expected "recoveries to occur with minimal or no data loss."