CVE-2026-19078: Ose-oauth-server: oauth-server: open redirect vulnerability enables phishing via unvalidated parameter.

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-11 · updated 2026-10-23
Weakness: CWE-601

Description

A flaw was found in the oauth-server component. This open redirect vulnerability occurs when the 'then' parameter in the grant approval handler is not properly validated. A remote attacker can craft a malicious URL that, when approved or denied by an authenticated user, redirects them to an attacker-controlled website. This could enable phishing attacks, potentially tricking users into revealing sensitive information.

Affected products

Red Hat OpenShift Container Platform 4.18: all versions

References

https://access.redhat.com/security/cve/CVE-2026-19078
https://bugzilla.redhat.com/show_bug.cgi?id=2511975

Get alerted when CVE-2026-19078 or the next vulnerability affects your stack