Vulnerability Database

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Total vulnerabilities in the database

CVE-2026-63190

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

FearlessCMS is a flat-file content management system centered on simplicity and open source. Prior to version 0.1.4, five debug/test PHP scripts under admin/ perform privileged operations without isLoggedIn() authentication checks, CSRF protection or adequate path validation. On PHP's built-in development server, including the default Docker deployment, router.php checks an unnormalized admin URI prefix while the filesystem resolves dot segments, so /./admin/ bypasses the admin login gate and executes those scripts directly. In admin/debug_save_flow.php, attacker-controlled path and content reach file_put_contents for arbitrary .md writes under content/ or outside it through path traversal, enabling site defacement and stored JavaScript in public pages; print_r($_POST) output without htmlspecialchars escaping also causes reflected cross-site scripting. The admin/debug_content.php path parameter reaches scandir(), file_get_contents() and posix_getpwuid(), permitting arbitrary directory enumeration and .md file reads that expose absolute paths, ownership, permissions, hashes and content previews. The admin/preview-handler.php endpoint accepts JSON content and title and writes enumerable files under content/_preview/, enabling stored cross-site scripting and disk exhaustion. The admin/testdebug.php endpoint appends to admin/testdebug.log without authentication, also enabling disk exhaustion. The admin/test_redirect.php script exposes a test artifact but escapes its inputs and is not itself an XSS sink. Stored script execution can steal sessions and compromise administrators when they view affected content. Reads and writes execute with PHP's privileges; the tested deployment runs PHP as root, amplifying filesystem impact. This issue is fixed in version 0.1.4.

  • Published: Oct 28, 2026
  • Updated: Nov 7, 2026
  • CVE: CVE-2026-63190
  • Severity: Critical
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Critical
  • Score: 9.4
  • AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

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Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.