Slack experienced a minor incident on November 20, 2025 affecting Login/SSO, lasting 10d 17h. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Nov 20, 2025, 11:30 PM UTC
Some users may experience trouble logging into Slack. We’re on the case and will provide another update once we have more details to share. We’re sorry for the disruption.
- investigating Nov 21, 2025, 12:01 AM UTC
We’ve identified a database authentication change that we believe caused this issue. We’ve reverted this change and via testing, believe users can now log in as expected to Slack services. We are currently validating this and will provide an update as soon as we have more to share.
- monitoring Nov 21, 2025, 12:09 AM UTC
Following a period of monitoring and with user validation now received, this issue has been resolved. We apologize for any inconvenience this issue may have caused.