CVE-2026-82273: Mastra-Ai Mastra

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Mastra through 1.63.0 contains an authentication bypass vulnerability in the memory API thread ownership validation when mapUserToResourceId callback is omitted from configuration. Authenticated attackers can enumerate all threads via GET /api/memory/threads and read conversation history and metadata of other resource owners.

Affected products

• Mastra-Ai Mastra: up to and including 1.63.0

Published 2026-08-28. Last modified 2026-09-23.