CVE-2025-26483: Dell PowerFlex Open Redirect Vulnerability

CVE-2025-26483 Overview

CVE-2025-26483 is an open redirect vulnerability [CWE-601] affecting Dell PowerFlex Manager versions 4.6.2 and prior. An unauthenticated attacker can craft a malicious URL that causes the application to redirect a targeted user to an arbitrary external web destination. The flaw enables phishing campaigns that abuse the trust users place in the legitimate PowerFlex Manager domain. Successful exploitation requires the victim to click the crafted link, but no authentication or prior access to the appliance is needed. Dell published fixes through advisories DSA-2025-434 and DSA-2025-435 covering the PowerFlex Appliance, PowerFlex Manager, and PowerFlex Rack product lines.

Critical Impact

Unauthenticated attackers can redirect PowerFlex Manager users to attacker-controlled URLs, enabling credential theft and malware delivery through phishing.

Affected Products

• Dell PowerFlex Manager (versions 4.6.2 and prior)
• Dell PowerFlex Appliance Intelligent Catalog
• Dell PowerFlex Rack

Discovery Timeline

• 2026-05-22 - CVE-2025-26483 published to NVD
• 2026-05-22 - Last updated in NVD database

Technical Details for CVE-2025-26483

Vulnerability Analysis

The vulnerability is classified as an Open Redirect (CWE-601: URL Redirection to Untrusted Site). PowerFlex Manager accepts a redirection parameter in a request handler and forwards the client to that destination without validating whether the target belongs to a trusted origin. Because the redirect logic operates before authentication, an unauthenticated attacker can construct a URL pointing to the legitimate PowerFlex Manager host while embedding an arbitrary external destination.

A scope change is present because the redirect transitions the user session from the trusted Dell management interface to an attacker-controlled origin. Although the vulnerability does not directly grant code execution or data access, it is a high-value primitive for phishing operations targeting storage administrators who have privileged access to enterprise infrastructure.

Root Cause

The root cause is insufficient validation of user-supplied URL parameters used in HTTP redirect responses. The application accepts external URLs in redirection logic without enforcing an allowlist of trusted destinations or rejecting absolute URLs that point outside the application origin.

Attack Vector

Exploitation occurs over the network and requires user interaction. An attacker crafts a URL that begins with the legitimate PowerFlex Manager hostname but includes a redirect parameter pointing to a malicious site. The link is delivered through email, chat, or other phishing channels. When the target clicks the URL, PowerFlex Manager processes the request and issues an HTTP redirect to the attacker domain, which can host a cloned login page or malware payload.

The vulnerability is described in prose only because no public proof-of-concept code or exploit has been released. Refer to the Dell Security Update DSA-2025-434 and Dell Security Update DSA-2025-435 for technical specifics.

Detection Methods for CVE-2025-26483

Indicators of Compromise

• Inbound HTTP requests to PowerFlex Manager URLs containing absolute external URLs in query parameters (for example, parameters carrying http:// or https:// values pointing to non-Dell hostnames).
• Web server logs showing 3xx redirect responses with Location headers referencing external domains.
• Phishing emails containing links to legitimate PowerFlex Manager hostnames with suspicious appended parameters.

Detection Strategies

• Parse PowerFlex Manager access logs for redirect responses where the destination host does not match the appliance fully qualified domain name (FQDN).
• Correlate user reports of unexpected login prompts following access to PowerFlex Manager links with proxy or DNS logs.
• Inspect email security gateway telemetry for messages referencing the PowerFlex Manager domain combined with URL redirection parameters.

Monitoring Recommendations

• Enable verbose HTTP logging on the PowerFlex Manager reverse proxy and forward logs to a centralized SIEM for retention and search.
• Alert on anomalous referrer patterns where users arrive at external login portals after originating from the PowerFlex Manager hostname.
• Track click telemetry from secure email gateways for URLs matching the PowerFlex Manager domain pattern.

How to Mitigate CVE-2025-26483

Immediate Actions Required

• Identify all Dell PowerFlex Manager, PowerFlex Appliance, and PowerFlex Rack deployments and confirm running versions.
• Apply the fixed releases referenced in Dell advisories DSA-2025-434 and DSA-2025-435 as the primary remediation.
• Notify storage and infrastructure administrators of the phishing risk and instruct them to validate URLs before authenticating.

Patch Information

Dell has published security updates that resolve CVE-2025-26483 for affected products. Customers should consult the Dell Security Update DSA-2025-434 for PowerFlex Appliance and Intelligent Catalog guidance, and the Dell Security Update DSA-2025-435 for PowerFlex Rack guidance. Upgrade from versions 4.6.2 and prior to the fixed release identified in each advisory.

Workarounds

• Restrict network access to PowerFlex Manager interfaces to trusted management networks and authenticated VPN users only.
• Configure upstream web application firewall (WAF) rules to strip or reject redirect parameters containing absolute external URLs.
• Train administrators to manually type or bookmark the PowerFlex Manager URL rather than following links from email.

# Example WAF rule (ModSecurity) to block external redirect parameters
SecRule ARGS_NAMES "@rx (redirect|url|next|return|returnUrl|target)" \
    "chain,deny,status:403,id:1002601,msg:'Blocked potential open redirect (CVE-2025-26483)'"
    SecRule ARGS "@rx ^(https?:)?//(?!powerflex\.internal\.example\.com)" \
        "t:lowercase,t:urlDecodeUni"