CVE-2026-14171 Overview
CVE-2026-14171 is an open redirect vulnerability [CWE-601] affecting a web-UI post-login redirect handler. The flaw stems from improper validation of the redirect parameter processed after user authentication. An unauthenticated remote attacker can craft a malicious link that, once clicked by a victim, redirects the browser to an attacker-controlled website. This enables phishing, credential harvesting, and delivery of malicious content under the trust context of the legitimate application. The vulnerability was disclosed through CERT VDE Advisory VDE-2026-076.
Critical Impact
Attackers can weaponize trusted application URLs to redirect authenticated users to malicious sites, resulting in loss of confidentiality and availability.
Affected Products
- Products listed in CERT VDE Advisory VDE-2026-076
- Specific affected components are not enumerated in the NVD record
- Refer to the vendor advisory for the authoritative product and version list
Discovery Timeline
- 2026-07-28 - CVE-2026-14171 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-14171
Vulnerability Analysis
The vulnerability is classified as a URL Redirection to Untrusted Site, also known as an open redirect [CWE-601]. The web-UI accepts a post-login redirect target from user-controlled input without properly validating that the destination points to an allowed internal location. An attacker constructs a URL that references the legitimate application but embeds an external destination in the redirect parameter. After the user authenticates, the application forwards the browser to the attacker's domain. Because the initial link appears to originate from a trusted host, users are more likely to trust the resulting page and interact with content served by the adversary.
Root Cause
The root cause is missing or insufficient validation of the redirect target parameter in the post-login flow. The application does not enforce an allowlist of trusted destinations and does not reject absolute URLs pointing to external hosts. Any value supplied as the redirect target is accepted and honored after successful authentication.
Attack Vector
Exploitation requires network access to the vulnerable web-UI and user interaction. An attacker delivers a crafted URL through email, chat, or a compromised site. The victim clicks the link, authenticates to the legitimate web-UI, and is then transparently redirected to the attacker-controlled domain. The attacker can host a cloned login page to capture re-entered credentials, serve malware, or run further browser-based attacks. No prior privileges on the target system are required.
No verified public exploit code is available for CVE-2026-14171. The vulnerability mechanism is described in prose only. See the CERT VDE Advisory VDE-2026-076 for authoritative technical detail.
Detection Methods for CVE-2026-14171
Indicators of Compromise
- Inbound HTTP requests to the web-UI containing redirect parameters whose values are absolute URLs referencing external domains
- Referer headers in outbound proxy logs showing users transitioning from the legitimate web-UI host to unrelated external domains immediately after login
- Phishing reports from users describing links that briefly displayed the legitimate login page before landing on an unfamiliar site
Detection Strategies
- Inspect web server and reverse proxy logs for post-login redirect parameters containing http://, https://, //, or encoded variants pointing to non-allowlisted hosts
- Alert on outbound redirects from the authentication endpoint that resolve to newly registered or low-reputation domains
- Correlate email gateway URL rewriting telemetry with clicks on links that embed the web-UI host and a suspicious redirect target
Monitoring Recommendations
- Enable verbose logging of redirect targets on the authentication path and forward events to a central log platform
- Monitor for spikes in 302 or 303 responses from the login handler pointing to external destinations
- Track user reports of unexpected redirects following legitimate application logins
How to Mitigate CVE-2026-14171
Immediate Actions Required
- Review CERT VDE Advisory VDE-2026-076 to identify affected products and versions in your environment
- Apply the vendor-provided patch or firmware update as soon as it is available for your platform
- Communicate the phishing risk to end users and instruct them to inspect the destination URL after logging in
Patch Information
Refer to CERT VDE Advisory VDE-2026-076 for vendor patch availability and remediation steps. The NVD entry does not include fixed version identifiers.
Workarounds
- Restrict access to the web-UI to trusted management networks using firewall or VPN controls
- Deploy a reverse proxy or web application firewall rule that strips or validates redirect parameters against an allowlist of internal paths
- Train administrators and users to hover over links and to log in only from bookmarked URLs rather than emailed links
# Example WAF rule concept: block absolute URLs in redirect parameters
# Reject requests where the redirect target contains an external scheme or host
SecRule ARGS_NAMES "@rx (redirect|returnUrl|next|url)" \
"chain,deny,status:400,id:1014171,msg:'Open redirect attempt CVE-2026-14171'"
SecRule ARGS "@rx ^(https?:)?//" "t:none,t:urlDecodeUni"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
