Auth bypass in Sim
CVE-2025-15099
A 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 the component CRON Secret Handler. The manipulation of the argument INTERNAL_API_SECRET leads to improper authentication. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The identifier of the patch is e359dc2946b12ed5e45a0ec9c95ecf91bd18502a. Applying a patch is the recommended action to fix this issue.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.008 (54.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: -0.000
Affected products
- Sim
- Simstudioai Sim — versions 0.5.0, 0.5.1, 0.5.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- gist.github.com/H2u8s/c533741e1b36f6245d41cace89a7f4d2 (related, Exploit, Third Party Advisory)
- github.com/simstudioai/sim/pull/2343 (issue-tracking, Exploit, Issue Tracking)
- gist.github.com/H2u8s/c533741e1b36f6245d41cace89a7f4d2 (Exploit, Third Party Advisory, exploit)
- github.com/simstudioai/sim/commit/e359dc2946b12ed5e45a0ec9c95ecf91bd18502a (Patch, patch)
Frequently asked questions
- What is CVE-2025-15099?
- CVE-2025-15099 is a high-severity vulnerability in Sim, classified under Improper Authentication. CVSS score: 7.3/10. Published 2025-12-26.
- How severe is CVE-2025-15099?
- High severity. CVSS v3 base score is 7.3 out of 10.