# CVE-2025-35430: CISA Thorium insecure downloaded file path validation

> A remote authenticated attacker can access arbitrary files via inadequate path validation in CISA Thorium.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Sep 2025
- **Updated:** 30 Sep 2025
- **Also known as:** GHSA-683m-m6wg-rhf3

## What is CVE-2025-35430?

CVE-2025-35430 is a medium-severity path traversal vulnerability in CISA Thorium, published on 17 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

CISA Thorium does not adequately validate the paths of downloaded files via 'download_ephemeral' and 'download_children'. A remote, authenticated attacker could access arbitrary files subject to file system permissions. Fixed in 1.1.2.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2025-35430?

It affects 1 product.


Products: Cisa Thorium.

## How do I fix CVE-2025-35430?

No fix has been published for CVE-2025-35430 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-35430 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-35430 exists.

## Other vulnerabilities in CISA Thorium

- [CVE-2025-35432](https://insights.sbomify.com/CVE-2025-35432/): CISA Thorium does not rate limit account verification email messages (medium 6.9)
- [CVE-2025-35436](https://insights.sbomify.com/CVE-2025-35436/): CISA Thorium account verification email error handling (medium 6.9)
- [CVE-2025-35431](https://insights.sbomify.com/CVE-2025-35431/): CISA Thorium LDAP injection (medium 5.3)
- [CVE-2025-35435](https://insights.sbomify.com/CVE-2025-35435/): CISA Thorium download stream divide by zero (medium 5.3)
- [CVE-2025-35433](https://insights.sbomify.com/CVE-2025-35433/): CISA Thorium does not properly invalidate previously used tokens (low 2.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-35430 and fix it if it is affected.

What it is: CVE-2025-35430 is a medium-severity path traversal vulnerability in CISA Thorium, published on 17 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-35430 exists.

Affected product: CISA Thorium. 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-2025-35430/ (Markdown: https://insights.sbomify.com/CVE-2025-35430/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-35430
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-35430
- OSV: https://osv.dev/vulnerability/CVE-2025-35430

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-35430/
Summaries are generated and may contain mistakes; the official description above is the record.