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CVE-2026-83589— Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect

Quick assessment

Affected
Red Hat Red Hat OpenShift Container Platform 4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 oauth-proxy 中发现了一个安全漏洞。该应用程序未能正确验证登录后的重定向目标参数（ ）。远程攻击者可以利用此漏洞，诱使用户点击一个精心构造的链接，导致用户在完成身份验证后被重定向到任意外部网站。这种开放重定向漏洞可被用于实施钓鱼攻击或窃取用户凭据。

CVSS 6.1 · Medium

Possible ATT&CK Techniques 1 AI

T1566 · Phishing
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I. Basic Information for CVE-2026-83589

Vulnerability Information
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Vulnerability Title
Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-83589

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III. Intelligence Information for CVE-2026-83589

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Other References for CVE-2026-83589 (2)

Same Patch Batch · Red Hat · 2026-10-01 · 4 CVEs total

CVE-2026-96577 7.1 HIGH Oc-mirror__release-4.21: embedded local cache registry listens on all interfaces without a
CVE-2026-103754 5.9 MEDIUM Ansible-runner: ansible-runner: path traversal and symlink escape in unstream_dir() allows
CVE-2026-103641 5.5 MEDIUM Gegl: gegl04: gegl: out-of-bounds read in the radiance hdr uncompressed scanline decoder

IV. Related Vulnerabilities

Same product: Red Hat OpenShift Container Platform 4
Same vendor: Red Hat
Same weakness: CWE-601

V. Comments for CVE-2026-83589

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