Vulnerability-Lookup

CVE-2026-82273 (GCVE-0-2026-82273)

Vulnerability from cvelistv5 – Published: 2026-08-28 16:18 – Updated: 2026-08-28 20:25

Title

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

Summary

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.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 20:25 UTC

CWE

CWE-862 - Missing Authorization

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/mastra-ai/mastra/issues/18911	issue-tracking
https://github.com/mastra-ai/mastra	product
https://github.com/mastra-ai/mastra/blob/b7e66f0c…	technical-description
https://www.vulncheck.com/advisories/mastra-memor…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
mastra-ai	mastra	Affected: 0 , ≤ 1.63.0 (semver)	guessed

Date Public

2026-07-03 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-82273

Vulnerability from fkie_nvd - Published: 2026-08-28 20:20 - Updated: 2026-08-28 22:16

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/mastra-ai/mastra
	disclosure@vulncheck.com	https://github.com/mastra-ai/mastra/blob/b7e66f0c478a227985e0062794ef058c3714fabf/packages/server/src/server/handlers/utils.ts
	disclosure@vulncheck.com	https://github.com/mastra-ai/mastra/issues/18911
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/mastra-memory-api-thread-ownership-check-is-a-no-op-when-mapusertoresourceid-is-unset
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/mastra-ai/mastra/issues/18911

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-Q48C-G8G8-2XQ8

Vulnerability from github – Published: 2026-08-28 21:31 – Updated: 2026-08-28 21:31

Details

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-82273"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T20:20:18Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-q48c-g8g8-2xq8",
  "modified": "2026-08-28T21:31:25Z",
  "published": "2026-08-28T21:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82273"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mastra-ai/mastra/issues/18911"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mastra-ai/mastra"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mastra-ai/mastra/blob/b7e66f0c478a227985e0062794ef058c3714fabf/packages/server/src/server/handlers/utils.ts"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/mastra-memory-api-thread-ownership-check-is-a-no-op-when-mapusertoresourceid-is-unset"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-82273 (GCVE-0-2026-82273)

FKIE_CVE-2026-82273

GHSA-Q48C-G8G8-2XQ8

Tags

Sightings

Nomenclature