CVE-2026-53683: Password Reset Open Redirect Vulnerability

CVE-2026-53683 Overview

CVE-2026-53683 is an open redirect vulnerability in the reset_password.html page. The page parses query string parameters and uses the url parameter as a redirection target via window.location = url after a password reset completes. An optional delay parameter controls the timing of the redirect. The application performs no validation or allowlisting on the url parameter. Attackers can craft password-reset links that redirect victims to arbitrary external sites after the workflow completes, supporting phishing and credential-harvesting campaigns.

Critical Impact
Attackers can redirect authenticated users to attacker-controlled domains immediately after password reset, enabling convincing phishing chains that leverage the trust of the legitimate reset workflow.

Affected Products

Applications shipping the vulnerable reset_password.html template
Red Hat distributions referenced in the advisory
Downstream products embedding the affected page

Discovery Timeline

2026-09-02 - CVE-2026-53683 published to NVD
2026-09-02 - Last updated in NVD database

Technical Details for CVE-2026-53683

Vulnerability Analysis

The flaw is a client-side open redirect [CWE-601]. The reset_password.html page reads user-controlled query parameters and assigns the url value directly to window.location. No parsing, origin comparison, or allowlist check is applied before navigation. The delay parameter defers the redirect, giving the attacker flexibility to render deceptive content beforehand.

Because the redirect executes on a legitimate domain, security-aware users inspecting the initial link see a trusted host. The browser then follows the JavaScript-triggered navigation to any URL the attacker supplies. This weakens phishing resistance and can defeat email link-inspection tools that only evaluate the visible destination.

The vulnerability requires user interaction: the victim must click the crafted reset link and complete or reach the reset flow. It does not disclose data or grant code execution on the application itself, but it materially assists downstream social engineering attacks.

Root Cause

The root cause is missing input validation on a URL parameter used in a client-side navigation sink. The template treats the url query value as trusted and passes it to window.location without checking scheme, host, or membership in a permitted redirect list.

Attack Vector

An attacker constructs a password-reset URL that includes url=https://attacker.example and optionally delay=N. The attacker delivers the link through email, chat, or a compromised page. After the victim reaches reset_password.html, the client-side script sets window.location to the attacker-supplied value, sending the browser to the malicious site.

The vulnerability is described in the Red Hat CVE-2026-53683 Advisory and the Red Hat Bug Fix Report #2487512. No verified proof-of-concept code is published; the mechanism is a direct assignment of an unvalidated query parameter to window.location.

Detection Methods for CVE-2026-53683

Indicators of Compromise

Web server access logs showing requests to reset_password.html containing external url= query parameters
Referrer chains where users leave the reset page immediately for unaffiliated domains
Email gateway telemetry containing reset links with embedded off-domain url values
Spikes in password-reset requests preceding phishing report volume

Detection Strategies

Deploy web application firewall rules that inspect query strings on reset endpoints and flag url parameters pointing off-domain
Correlate authentication events with subsequent outbound redirects to non-corporate hosts
Use browser or proxy telemetry to detect JavaScript-initiated navigations from the reset page to unexpected destinations

Monitoring Recommendations

Alert on reset_password.html requests where the url parameter fails an allowlist check
Track user-agent and referrer patterns following password-reset completion
Monitor phishing-report queues for URLs that traverse the legitimate reset page

How to Mitigate CVE-2026-53683

Immediate Actions Required

Apply vendor patches referenced in the Red Hat CVE-2026-53683 Advisory
Replace direct window.location = url assignments with allowlist-validated navigation
Remove or ignore the url and delay query parameters until validation is in place
Notify users of active phishing risk tied to password-reset workflows

Patch Information

Refer to the Red Hat CVE-2026-53683 Advisory and the Red Hat Bug Fix Report #2487512 for fixed package versions and errata. Apply updates through standard distribution channels and verify the affected template no longer processes attacker-controlled redirect targets.

Workarounds

Strip the url and delay parameters at the web server or reverse proxy before the request reaches the reset page
Enforce a Content Security Policy that limits navigation to same-origin destinations
Modify reset_password.html to validate url against an internal allowlist of redirect targets
Redirect all completed password resets to a fixed, server-controlled landing page

bash

# Example NGINX rule to strip attacker-controlled redirect parameters
location = /reset_password.html {
    if ($arg_url) { return 302 /reset_password.html; }
    if ($arg_delay) { return 302 /reset_password.html; }
    try_files $uri =404;
}