# CVE-2026-11431: Path Traversal in Altium Projects Service Allows Arbitrary File Read

> Authenticated attackers can exploit path traversal in Altium Projects Service to read arbitrary server files, including sensitive configuration and credentials.

- **Severity:** High 8.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/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:** 5 Jun 2026
- **Updated:** 8 Jun 2026
- **Also known as:** GHSA-96xj-rmhf-c584

## What is CVE-2026-11431?

CVE-2026-11431 is a high-severity path traversal vulnerability in Altium 365, published on 5 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A path traversal vulnerability exists in the Projects Service download endpoint shared by Altium Enterprise Server and Altium 365. An authenticated user can supply a crafted path parameter that bypasses validation, allowing arbitrary files (including entire directories returned as archives) to be read from the server filesystem.

Because the readable files include service configuration and credential material, exploitation can be used to gather information enabling further compromise. The issue can be combined with CVE-2026-11424 to reach the cloud-side endpoint. On multi-tenant Altium 365 deployments, the readable configuration could have exposed credentials shared across services. Altium Enterprise Server is fixed in 8.1.1; the issue has been remediated in Altium 365 at the service level.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-11431?


## How do I fix CVE-2026-11431?

No fix has been published for CVE-2026-11431 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11431 being exploited?

There is no known exploitation of CVE-2026-11431 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11431 and fix it if it is affected.

What it is: CVE-2026-11431 is a high-severity path traversal vulnerability in Altium 365, published on 5 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-11431 in the wild and no public exploit code.

Affected product: Altium 365. 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-2026-11431/ (Markdown: https://insights.sbomify.com/CVE-2026-11431/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11431
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11431
- OSV: https://osv.dev/vulnerability/CVE-2026-11431

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11431/
Summaries are generated and may contain mistakes; the official description above is the record.