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.
- 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
- None listed
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.
Which versions are affected by CVE-2025-66029?
It affects 1 product.
Products include 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
Sources
Also known as GHSA-2cwp-8g29-9q32.