# CVE-2026-1181: Altium 365 Over-Permissive CORS Configuration Allows Credentialed Cross-Origin Workspace Access

> Overly permissive CORS settings allow cross-origin access to authenticated workspace APIs, enabling data theft and control bypass.

- **Severity:** Critical 9.0 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 19 Jan 2026
- **Updated:** 26 Jan 2026
- **Also known as:** GHSA-pfq7-53pj-q6wc

## What is CVE-2026-1181?

CVE-2026-1181 is a critical vulnerability in Altium 365, published on 19 Jan 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Altium 365 workspace endpoints were configured with an overly permissive Cross-Origin Resource Sharing (CORS) policy that allowed credentialed cross-origin requests from other Altium-controlled subdomains, including forum.live.altium.com. As a result, JavaScript executing on those origins could access authenticated workspace APIs in the context of a logged-in user. When chained with vulnerabilities in those external applications, this misconfiguration enables unauthorized access to workspace data, administrative actions, and bypass of IP allowlisting controls, including in GovCloud environments.

Weakness: CWE-942 (Permissive Cross-domain Security Policy with Untrusted Domains), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-1181?


## How do I fix CVE-2026-1181?

No fix has been published for CVE-2026-1181 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1181 being exploited?

There is no known exploitation of CVE-2026-1181 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1181 and fix it if it is affected.

What it is: CVE-2026-1181 is a critical vulnerability in Altium 365, published on 19 Jan 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-1181 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-2026-1181/ (Markdown: https://insights.sbomify.com/CVE-2026-1181/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1181
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1181
- OSV: https://osv.dev/vulnerability/CVE-2026-1181

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1181/
Summaries are generated and may contain mistakes; the official description above is the record.