Post mortem on Linear security incident on March 24th, 2026

On March 24, 2026, Linear experienced a security incident where a code change inadvertently allowed data from private teams to be accessible to other members within the same workspace for approximately one hour. This occurred due to a variable shadowing bug in a performance optimization that bypassed crucial permission checks. The issue was quickly identified, the code change was reverted, and affected sessions were cleared, with workspace owners notified within 48 hours. While no data was exposed to individuals outside their respective workspaces, internal data such as issues, comments, and projects were visible across team boundaries through notification emails and data syncs. Following the incident, Linear conducted an audit to ensure no malicious activity had occurred and implemented expanded testing and monitoring measures to prevent future occurrences. The company has committed to further improvements in its security protocols to maintain customer trust and transparency.

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