CVE-2026-83589 Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect
Attackers can redirect authenticated users to malicious sites via crafted links, enabling phishing or credential theft in OpenShift environments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-83589?
CVE-2026-83589 is a medium-severity vulnerability in Red Hat OpenShift Container Platform 4.12, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A flaw was found in oauth-proxy. The application fails to properly validate the destination redirect parameter (`rd`) during post-login redirection. A remote attacker can exploit this vulnerability by enticing a user to follow a specially crafted link, resulting in the user being redirected to an arbitrary external website after authenticating. This open redirect can be leveraged to conduct phishing attacks or credential theft.
Weakness: CWE-601
Which versions are affected by CVE-2026-83589?
How do I fix CVE-2026-83589?
No fix has been published for CVE-2026-83589 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-83589 being exploited?
There is no known exploitation of CVE-2026-83589 in the wild and no public exploit code.
Sources
Also known as GHSA-8c7h-7vm9-jhj3.