# CVE-2025-66029: Open OnDemand affected by Apache proxy passing sensitive headers

> Open OnDemand's Apache proxy leaks sensitive authentication headers to origin servers, allowing malicious users to steal credentials from unsuspecting users.

- **Severity:** High 7.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N`)
- **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:** 17 Dec 2025
- **Updated:** 18 Dec 2025
- **Also known as:** GHSA-2cwp-8g29-9q32

## What is CVE-2025-66029?

CVE-2025-66029 is a high-severity vulnerability in OSC ondemand, published on 17 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Open OnDemand provides remote web access to supercomputers. In versions 4.0.8 and prior, the Apache proxy allows sensitive headers to be passed to origin servers. This means malicious users can create an origin server on a compute node that record these headers when unsuspecting users connect to it. Maintainers anticipate a patch in a 4.1 release. Workarounds exist for 4.0.x versions. Using `custom_location_directives` in `ood_portal.yml` in version 4.0.x (not available for versions below 4.0) centers can unset and or edit these headers. Note that `OIDCPassClaimsAs both` is the default and centers can set `OIDCPassClaimsAs ` to `none` or `environment` to stop passing these headers to the client. Centers that have an OIDC provider with the `OIDCPassClaimsAs` with `none` or `environment` settings can adjust the settings using guidance provided in GHSA-2cwp-8g29-9q32 to unset the mod_auth_openidc_session cookies.

Weakness: CWE-523 (Unprotected Transport of Credentials), CWE-522 (Insufficiently Protected Credentials)

## Which versions are affected by CVE-2025-66029?

It affects 1 product.


Products: Osc Open Ondemand.

## How do I fix CVE-2025-66029?

No fix has been published for CVE-2025-66029 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-66029 being exploited?

There is no known exploitation of CVE-2025-66029 in the wild and no public exploit code.

## Other vulnerabilities in OSC ondemand

- [CVE-2020-36247](https://insights.sbomify.com/CVE-2020-36247/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2026-26002](https://insights.sbomify.com/CVE-2026-26002/): OnDemand susceptible to malicious input when navigating to a directory. (medium 6.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-66029 and fix it if it is affected.

What it is: CVE-2025-66029 is a high-severity vulnerability in OSC ondemand, published on 17 Dec 2025. 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-2025-66029 in the wild and no public exploit code.

Affected product: OSC ondemand. 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-2025-66029/ (Markdown: https://insights.sbomify.com/CVE-2025-66029/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66029
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66029
- OSV: https://osv.dev/vulnerability/CVE-2025-66029

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66029/
Summaries are generated and may contain mistakes; the official description above is the record.