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Cheshire Cat AI CVE-2026-85093

| EUVDEUVD-2026-70303 HIGH
Incorrect Authorization (CWE-863)
2026-09-03 VulnCheck GHSA-cx5g-gfhq-8qmj
7.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
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/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
vuln.today AI
6.5 MEDIUM

Network API requires a low-privilege authenticated account (MEMORY:READ); read-only cross-user data exposure yields C:H with no integrity or availability impact and no scope change.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Metadata Corrected
Sep 03, 2026 - 01:40 vuln.today
tag: Authentication Bypass removed
Analysis Generated
Sep 03, 2026 - 01:29 vuln.today
CVE Published
Sep 03, 2026 - 01:04 cve.org
HIGH 7.1

DescriptionCVE.org

Cheshire Cat AI's GET /memory/collections/{collection_id}/points endpoint fails to apply per-user filtering when retrieving episodic memory points. Authenticated attackers with MEMORY:READ permission can retrieve all users' stored conversation messages and personal data by paginating through the collection using the offset cursor.

AnalysisAI

Incorrect authorization in Cheshire Cat AI's GET /memory/collections/{collection_id}/points endpoint allows any authenticated user holding MEMORY:READ permission to retrieve episodic memory records belonging to all other users by paginating through the collection via the offset cursor. The route implementation in core/cat/routes/memory/points.py omits per-user scoping when querying the vector store, exposing stored conversation histories and personal data across the entire tenant base. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Requires a valid authenticated account on the Cheshire Cat AI instance with MEMORY:READ permission explicitly granted. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N scoring 7.1 accurately represents the risk profile: network-accessible, no attack complexity, low-privilege prerequisite (valid account with MEMORY:READ), high confidentiality impact, and no integrity or availability consequences. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patched version is confirmed from the available data. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, immediately restrict MEMORY:READ permission grants to only users with documented business need, review and disable unnecessary service accounts with these permissions, and enable alerting on GET /memory/collections endpoint access patterns. …

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CVE-2026-85093 vulnerability details – vuln.today

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