# CVE-2025-15099: simstudioai sim CRON Secret internal.ts improper authentication

> Attackers can bypass authentication in the CRON Secret Handler by manipulating the internal API secret, requiring a patch to secure the application.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Dec 2025
- **Updated:** 26 Dec 2025
- **Also known as:** GHSA-2hg8-9339-xpwg

## What is CVE-2025-15099?

CVE-2025-15099 is a medium-severity authentication bypass vulnerability in simstudioai sim, published on 26 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2025-15099?

It affects 1 product.


Products: Sim Sim.

## How do I fix CVE-2025-15099?

No fix has been published for CVE-2025-15099 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-15099 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-15099 exists.

## Other vulnerabilities in simstudioai sim

- [CVE-2026-3431](https://insights.sbomify.com/CVE-2026-3431/): Sim Studio AI - MongoDB SSRF and Arbitrary Document Deletion (critical 9.8)
- [CVE-2026-3432](https://insights.sbomify.com/CVE-2026-3432/): Sim Studio AI - Unauthenticated OAuth Token Theft (critical 9.3)
- [CVE-2025-7107](https://insights.sbomify.com/CVE-2025-7107/): SimStudioAI sim route.ts handleLocalFile path traversal (medium 6.9)
- [CVE-2025-7114](https://insights.sbomify.com/CVE-2025-7114/): SimStudioAI sim Session route.ts POST missing authentication (medium 6.9)
- [CVE-2025-10096](https://insights.sbomify.com/CVE-2025-10096/): SimStudioAI sim route.ts server-side request forgery (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-15099 and fix it if it is affected.

What it is: CVE-2025-15099 is a medium-severity authentication bypass vulnerability in simstudioai sim, published on 26 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-15099 exists.

Affected product: simstudioai sim. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-15099/ (Markdown: https://insights.sbomify.com/CVE-2025-15099/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-15099
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-15099
- OSV: https://osv.dev/vulnerability/CVE-2025-15099

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-15099/
Summaries are generated and may contain mistakes; the official description above is the record.