How severe is CVE-2026-3432?

CVE-2026-3432 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-3432 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3432?

CVE-2026-3432 affects Sim. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3432?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-3432 have an EU (EUVD) identifier?

Yes. CVE-2026-3432 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9173.

When was CVE-2026-3432 published?

CVE-2026-3432 was published on 2026-03-02 and last updated on 2026-06-17.

CVE-2026-3432

CVE-2026-3432 is a critical-severity vulnerability in Sim with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 9.3
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9173
Weakness: CWE-862
Affected product: Sim
Published: 2026-03-02
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-3432?: 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.
How severe is CVE-2026-3432?: CVE-2026-3432 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-3432 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3432?: CVE-2026-3432 affects Sim. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3432?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-3432 have an EU (EUVD) identifier?: Yes. CVE-2026-3432 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9173.
When was CVE-2026-3432 published?: CVE-2026-3432 was published on 2026-03-02 and last updated on 2026-06-17.

References

https://www.tenable.com/security/research/tra-2026-13

Affected products (1)

cpe:2.3:a:sim:sim:*:*:*:*:*:*:*:*

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