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CVE-2026-82273

Mastra Memory API Thread Ownership Check Is a No-op When mapUserToResourceId Is Unset

CVSS 4.0 7.1 HIGHCVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-82273

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-82273

Published

@mastra/server

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "mastra-ai",
                    "product": "mastra",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "1.63.0",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "packageName": "@mastra/server"
                }

Original source record · Cite this exact observation · Complete original publisher JSON