KnowBe4 incident
PhishER Showing Incorrect Subject Line for Inbox Messages
Resolved after 4 hours 43 minutes, affecting Inbox, on March 10, 2026.
On Tuesday, March 10, 2026, from approximately 15:22 until 20:35 \(UTC\), the EU and US instances of the PhishER console displayed an incorrect subject line for some messages reported with the Phish Alert Button \(PAB\). This incident was caused by a configuration change to the PhishER message ingester service, which unexpectedly affected messages that were reported with some PAB versions. Once we reverted the change and updated the ingester service, PhishER was able to return to normal performance by 20:35 \(UTC\). To prevent this type of issue in the future, we reviewed the ingester service processes and implemented additional testing for messages reported with the PAB. No data loss occurred as a result of this issue.
Affected components
Update timeline
- identified Mar 10, 2026, 03:48 PM UTC
Our development team has identified an issue causing ingested messages in PhishER to display the incorrect sender address.
- monitoring Mar 10, 2026, 05:02 PM UTC
A fix has been implemented and we are monitoring the results.
- resolved Mar 10, 2026, 08:32 PM UTC
This incident has been resolved.
- postmortem May 13, 2026, 05:53 PM UTC
On Tuesday, March 10, 2026, from approximately 15:22 until 20:35 \(UTC\), the EU and US instances of the PhishER console displayed an incorrect subject line for some messages reported with the Phish Alert Button \(PAB\). This incident was caused by a configuration change to the PhishER message ingester service, which unexpectedly affected messages that were reported with some PAB versions. Once we reverted the change and updated the ingester service, PhishER was able to return to normal performance by 20:35 \(UTC\). To prevent this type of issue in the future, we reviewed the ingester service processes and implemented additional testing for messages reported with the PAB. No data loss occurred as a result of this issue.
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