CVE-2026-3432: Sim

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Sim Sim: before 0.5.74 (fixed in 0.5.74)

Published 2026-03-02. Last modified 2026-06-17.