Medium [CVE-2026-19078] Open redirect vulnerability enables phishing via unvalidated parameter.
This medium-severity Red Hat Linux advisory covers CVE-2026-19078 affecting Red Hat OpenShift Container Platform 4.
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Summary
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.
Red Hat has determined that this vulnerability is Low severity. The open redirect in the OAuth server's grant handler enables phishing by redirecting users to attacker-controlled origins after the consent prompt, but does not expose OAuth tokens, authorization codes, or session credentials.
The authorization code is issued separately to the client's registered redirect_uri. Weakness: CWE-601.
Affected Red Hat products: Red Hat OpenShift Container Platform 4. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Mitigation checklist
- There is no mitigation for this flaw. However, the risk is limited as the vulnerability only enables phishing — no OAuth tokens, authorization codes, or session credentials are exposed through the redirect.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
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