Outage report · Partial outage

Slack outage on May 27, 2026

Incident: Trouble with Slack - General Slack functionality issues

SeverityPartial outage

StartedMay 27, 2026, 23:00UTC

ResolvedMay 28, 2026, 15:22UTC

Duration16h 21m

What happened

Slack reported a partial outage starting May 27, 2026, 23:00 UTC. It was marked resolved at May 28, 2026, 15:22 UTC.

The incident lasted 16h 21m from first report to resolution.
It was the 3rd longest of 10 significant outages Slack reported in the 12 months up to it.
Slack had reported 3 other partial or major outages in the 90 days before it.
5 other vendors we track reported a significant incident within 12 hours of it.

Latest update from Slack

4:00pm PDT We're investigating a new incident.Current impact to end users:  We’re aware of an issue affecting workflows, message edits, channel renames, apps, and channel creations.We'll provide an update within 30 minutes including further details on current actions being taken. 4:31pm PDT We continue to investigate the issue, and are‌ implementing fixes to restore services. We're starting to see some improvements from the fixes implemented so far. We’ll provide another update as soon as we have more information, and again we are sorry for the inconvenience this is causing.  6:03pm PDT Teams continue to implement configuration adjustments and deployment fixes to resolve the issue. All features except for Workflows and Messaging should be recovered. Some lingering impact remains. Users may notice:Empty pills instead of @-mentionDelayed reacjiMismatch in Channel member count and channel membershipSlow loading of messages, user avatars, and unfurlsWe are working with urgency to

Read Slack's official incident report ↗