CVE-2025-9108: Login Page Auth Bypass Vulnerability

CVE-2025-9108 Overview

CVE-2025-9108 affects an unknown function within the Login Page component of an undisclosed product. The vulnerability stems from improper restriction of rendered UI layers or frames [CWE-1021], commonly known as clickjacking. Attackers can exploit the flaw remotely over the network by tricking a user into interacting with a framed login interface. The issue is tracked in VulDB as entry 320430 and requires user interaction to succeed. Neither the vendor nor affected product versions are disclosed in the published advisory data.

Critical Impact
Remote attackers can frame the login page and hijack user clicks to trigger unintended actions, potentially exposing credentials submitted through the overlaid interface.

Affected Products

Vendor: Not Available
Product: Not Available (Login Page component)
Affected versions: Not Available

Discovery Timeline

2025-08-18 - CVE-2025-9108 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-9108

Vulnerability Analysis

CVE-2025-9108 is a UI redressing weakness in the Login Page component. The application fails to restrict how its authentication interface can be rendered inside external frames such as <iframe>, <frame>, <embed>, or <object> elements. An attacker who controls a malicious page can load the vulnerable login page as a transparent overlay above decoy content. When a victim interacts with the visible bait, the click is intercepted by the hidden login form. The vulnerability requires user interaction and does not require authentication. Its scope is limited to integrity impact on the affected page, with no direct confidentiality or availability effects reported.

Root Cause

The root cause is the absence of frame-busting controls on the login response. Standard mitigations against [CWE-1021] include the X-Frame-Options HTTP header set to DENY or SAMEORIGIN, and a Content Security Policy (CSP) frame-ancestors directive limiting embedding origins. When these controls are missing or misconfigured, any external origin may embed the login page.

Attack Vector

The attack vector is network-based and passive from the server perspective. An adversary hosts a crafted HTML page that loads the target login URL inside a positioned, transparent frame. Overlaid decoy elements such as buttons or CAPTCHAs are aligned with the framed login form's submit control or credential fields. A user visiting the attacker's site performs what appears to be a benign action while actually submitting or approving actions on the framed login page. See the VulDB entry 320430 for the original submission details.

Detection Methods for CVE-2025-9108

Indicators of Compromise

Referer headers on login page requests originating from unrelated third-party domains.
Sudden increases in login attempts preceded by page loads that lack expected same-origin navigation history.
User reports of unexpected authentication prompts or session actions after visiting untrusted sites.

Detection Strategies

Inspect HTTP responses from the login endpoint for missing X-Frame-Options and Content-Security-Policy: frame-ancestors headers.
Monitor web application logs for Referer values pointing to unknown external origins immediately before authentication events.
Use browser telemetry or client-side JavaScript to report when the login page is loaded inside a frame it does not expect.

Monitoring Recommendations

Enable CSP violation reporting via the report-to or report-uri directives to capture framing attempts.
Alert on anomalous geographic or referrer patterns for authentication traffic in SIEM dashboards.
Track user-agent and session behavior for click patterns inconsistent with normal login flows.

How to Mitigate CVE-2025-9108

Immediate Actions Required

Add X-Frame-Options: DENY or SAMEORIGIN to all HTTP responses serving the login page.
Deploy a Content Security Policy that includes frame-ancestors 'none' or an explicit allowlist.
Educate users to authenticate only through direct navigation to the primary application URL, not via third-party links.

Patch Information

No vendor patch has been published in the referenced advisory data. Consult the VulDB CTI Indicator and VulDB Submission 627923 for status updates. Apply framing protection headers at the web server, reverse proxy, or CDN layer as an interim control.

Workarounds

Configure the reverse proxy or load balancer to inject X-Frame-Options and CSP frame-ancestors headers on all authentication routes.
Implement client-side frame-busting JavaScript as a defense-in-depth measure for legacy browsers.
Require re-authentication and step-up verification for sensitive post-login actions to reduce impact if clickjacking succeeds.

bash

# Example: enforce framing restrictions in nginx
add_header X-Frame-Options "DENY" always;
add_header Content-Security-Policy "frame-ancestors 'none'" always;