What is the CVSS score of CVE-2026-3432?

CVE-2026-3432 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-3432?

Within 24 hours: Identify all SimStudio instances and their versions; isolate or disable the `/api/auth/oauth/token` endpoint if possible; enable enhanced logging on authentication events. Within 7 days: Contact vendor for patch availability and deployment timeline; implement network-based controls to restrict access to the vulnerable endpoint; conduct access logs review for suspicious OAuth token requests. Within 30 days: Deploy patched SimStudio version 0.5.74 or later across all instances; perform forensic analysis for evidence of exploitation; reset credentials for all user accounts as precaution.

Sim CVE-2026-3432

CRITICAL

Missing Authorization (CWE-862)

2026-03-02 vulnreport@tenable.com

Authentication Bypass Sim

9.1

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send POST request to /api/auth/oauth/token
Exploit

Supply credentialAccountUserId and providerId parameters
Execution

Bypass authorization checks
Impact

Retrieve OAuth access token for target user

Vulnerability Assessment

Weakness	CWE CWE-862 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Authorization checks on every request MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	SimStudio version below 0.5.74 with /api/auth/oauth/token endpoint exposed. No authentication required; unauthenticated remote access to default endpoint configuration.
Impact	CVSS 9.1 — combined with CVE-2026-3431 (MongoDB access), SimStudio has two critical access control failures.
Exploit ScenarioDerived	An attacker crafts an OAuth token request that returns a token with admin privileges.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

SimStudio has a second authorization flaw in the OAuth token endpoint that allows privilege escalation through crafted token requests.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.1

OAuth token endpoint flaw in SimStudio enables privilege escalation.

RemediationAI

Update SimStudio.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

SimStudio < 0.5.74 has a CWE-862 authorization bypass in /api/auth/oauth/token that allows attackers to obtain tokens with elevated privileges.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.1 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

DescriptionCVE.org

On SimStudio version below to 0.5.74, the /api/auth/oauth/token endpoint contains a code path that bypasses all authorization checks when provided with credentialAccountUserId and providerId parameters. An unauthenticated attacker can retrieve OAuth access tokens for any user by supplying their user ID and a provider name, effectively stealing credentials to third-party services.

Executive ViewAI

Why It Matters

A critical authentication bypass vulnerability in SimStudio versions below 0.5.74 allows attackers to gain unauthorized access to user accounts without valid credentials by exploiting the OAuth token endpoint. This affects all organizations using vulnerable SimStudio instances and could lead to unauthorized data access, account takeover, and potential lateral movement within connected systems.

Business Impact: Severe

Compensating Controls

Implement WAF rules to block requests to /api/auth/oauth/token containing credentialAccountUserId or providerId parameters; restrict network access to the OAuth endpoint via firewall rules to trusted internal sources only; disable OAuth functionality entirely if not operationally required; implement IP whitelisting for API access; enable multi-factor authentication on all SimStudio user accounts; deploy real-time anomaly detection on authentication patterns.

Threat Intelligence Overview

EPSS Score

0.1%

Top 74% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.