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stigmem-node CVE-2026-76237

| EUVDEUVD-2026-62477 HIGH
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-08-19 VulnCheck GHSA-w2cf-363h-rwff
Authentication Bypass Stigmem
8.6
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/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
8.1 HIGH

Network-reachable endpoints, low complexity once conditions met; tenant write credential required (PR:L); cross-tenant data access contained within the same node system (S:U); no availability impact.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Aug 19, 2026 - 15:17 EUVD
Source Code Evidence Fetched
Aug 19, 2026 - 14:40 vuln.today
Analysis Generated
Aug 19, 2026 - 14:40 vuln.today
CVE Published
Aug 19, 2026 - 14:02 cve.org
HIGH 8.6

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 11 pypi packages depend on stigmem-node (11 direct, 0 indirect)

Ecosystem-wide dependent count for version 0.9.0a12.

DescriptionCVE.org

stigmem-node before 0.9.0a12 contains a broken object level authorization (cross-tenant BOLA) vulnerability in the quarantine review endpoints. On multi-tenant deployments running the opt-in stigmem-plugin-multi-tenant, the list/count queries and _get_quarantined_fact in routes/quarantine.py lacked a tenant_id predicate and the garden lookup was not tenant-scoped, allowing a tenant administrator with only a plain tenant write capability to list, read, and admit or reject quarantined facts belonging to other tenants via the /v1/quarantine endpoints. Default single-tenant deployments are not affected.

AnalysisAI

Cross-tenant broken object level authorization (BOLA) in stigmem-node exposes quarantined facts across tenant boundaries on multi-tenant deployments. A tenant administrator holding only a standard tenant write capability can list, read, and admit or reject quarantined facts belonging to any other tenant on the same node via the /v1/quarantine endpoints - bypassing isolation enforced by the stigmem-plugin-multi-tenant plugin. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as tenant admin on any tenant
Delivery
Send GET /v1/quarantine/list without tenant filter enforcement
Exploit
Enumerate quarantined facts from all tenants
Execution
Select target tenant's fact IDs
Persist
POST /v1/quarantine/{id}/admit or /reject
Impact
Alter other tenant's moderation state
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Vulnerability AssessmentAI

Exploitation The stigmem-plugin-multi-tenant opt-in plugin must be installed and active on the node - this is a non-default configuration. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.6 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N) reflects a network-reachable, low-complexity flaw requiring only authenticated tenant-level access with no availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A tenant administrator on tenant-B of a multi-tenant stigmem node sends an authenticated GET request to /v1/quarantine/list; because the list query lacks a tenant_id predicate, the response includes quarantined facts belonging to tenant-A. The attacker then issues a POST to /v1/quarantine/{fact_id}/admit using a fact ID from tenant-A, successfully admitting that tenant's content using only their tenant-B write credential. …
Remediation Vendor-released patch: 0.9.0a12. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: audit your stigmem-node inventory to identify which deployments use multi-tenant configuration and determine exposure scope, then disable or restrict access to /v1/quarantine endpoints if not operationally critical. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-76237 vulnerability details – vuln.today
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