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VulnerabilityPublished

CVE-2026-3431: SimStudioAI sim · Missing Authorization

Affects SimStudioAI simSource CVE Database V5

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Not known to be exploited · CVSS 9.8 Critical : upgrade to 0.5.74 as a priority.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.

Contested

Critical score, yet low EPSS after six months
EPSS
0.4% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.5.74
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade SimStudioAI sim to 0.5.74.

Affected software

ProductAffectedFixed in
SimStudioAIsimAffected
  • <0.5.74
Fixed in
  • 0.5.74
GitHubsimpkg:github/simOther threatsAffected
  • <0.5.74
Fixed in
  • 0.5.74

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, implement strict network segmentation to isolate MongoDB instances from untrusted networks and restrict access to the vulnerable endpoints using firewall rules or network access control lists. Employ application-layer gateways or reverse proxies to enforce authentication and host validation on MongoDB tool endpoints. Conduct thorough audits of all exposed database interfaces to ensure no unauthorized access paths exist. Monitor network traffic for unusual MongoDB connection attempts originating from the sim product or related systems. Implement robust logging and alerting to detect suspicious activities targeting database endpoints. Additionally, review and enforce the principle of least privilege on MongoDB user accounts to limit the potential damage from unauthorized access. Educate development teams on secure coding practices to prevent missing authorization vulnerabilities in future releases.

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.

References

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