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Vulnerability record · CVE-2026-3431 · published 2 March 2026

CVE-2026-3431: Sim missing authorization vulnerability

Sim · Sim

On SimStudio version below to 0.5.74, the MongoDB tool endpoints accept arbitrary connection parameters from the caller without authentication or host restrictions. An attacker can leverage these endpoints to connect to any reachable MongoDB instance and perform unauthorized operations including reading, modifying, and deleting data.

9.8 CVSS 3.1 Critical EPSS 0.61% · top 52.8% CWE-862 · Missing authorization
9.8CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

On SimStudio version below to 0.5.74, the MongoDB tool endpoints accept arbitrary connection parameters from the caller without authentication or host restrictions. An attacker can leverage these endpoints to connect to any reachable MongoDB instance and perform unauthorized operations including reading, modifying, and deleting data.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.tenable.com/security/research/tra-2026-12 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.3CVE-2026-3432Sim missing authorization vulnerabilityOn SimStudio version below to 0.5.74, the `/api/auth/oauth/token` endpoint contains a code path that bypasses all authorization checks when provided …EPSS 0.45%5.5CVE-2025-15099Sim improper authentication vulnerabilityA vulnerability was identified in simstudioai sim up to 0.5.27. This vulnerability affects unknown code of the file apps/sim/lib/auth/internal.ts of …EPSS 0.79%5.5CVE-2025-7114Sim improper authentication vulnerabilityA vulnerability was found in SimStudioAI sim up to 37786d371e17d35e0764e1b5cd519d873d90d97b. It has been declared as critical. Affected by this vulne…EPSS 0.57%5.5CVE-2025-7107Sim path traversal vulnerabilityA vulnerability classified as critical has been found in SimStudioAI sim up to 0.1.17. Affected is the function handleLocalFile of the file apps/sim/…EPSS 0.86%5.3CVE-2025-10097Sim injection vulnerabilityA vulnerability was identified in SimStudioAI sim up to 1.0.0. This impacts an unknown function of the file apps/sim/app/api/function/execute/route.t…EPSS 0.78%2.1CVE-2025-10096Sim server-side request forgery (ssrf) vulnerabilityA vulnerability was determined in SimStudioAI sim up to 1.0.0. This affects an unknown function of the file apps/sim/app/api/files/parse/route.ts. Ex…EPSS 0.28%2.1CVE-2025-9805Sim server-side request forgery (ssrf) vulnerabilityA vulnerability was found in SimStudioAI sim up to 51b1e97fa22c48d144aef75f8ca31a74ad2cfed2. This issue affects some unknown processing of the file a…EPSS 0.29%2.1CVE-2025-9800Sim improper access control vulnerabilityA weakness has been identified in SimStudioAI sim up to ed9b9ad83f1a7c61f4392787fb51837d34eeb0af. Affected by this issue is the function Import of th…EPSS 0.32%

Source: NIST National Vulnerability Database (record CVE-2026-3431), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.