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PHP File Inclusion (RFI/LFI)Weakness · CWE-98

CVE-2026-40731

HIGH · 8.1 CVSS v3.1 Published 2026-06-17
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
90/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Unauthenticated Local File Inclusion in ChapterOne <= 1.7 versions.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Unauthenticated Local File Inclusion vulnerability in ChapterOne versions 1.7 and below allows remote attackers to read arbitrary local files on the server via unsanitized user input passed to a file inclusion mechanism.

MitigationUpgrade ChapterOne to a patched version if available, or implement strict input validation and whitelist-based file inclusion controls to prevent path traversal attacks.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify ChapterOne version
    Locate the version file or header in the ChapterOne installation (commonly in README, version.php, or application metadata). Compare the installed version to the affected range (1.7 and below).
    Affected if The installed version is 1.7 or lower
  2. Verify file inclusion functionality is accessible
    Identify endpoints or parameters in the application that perform file inclusion (include, require, include_once, require_once, or similar functions). Confirm these are reachable without authentication.
    Affected if File inclusion functions are accessible to unauthenticated users
  3. Test for path traversal in file inclusion parameters
    Submit requests with traversal sequences (e.g., ../../etc/passwd) to identified file inclusion endpoints. Check if the application returns contents of files outside the intended directory.
    Affected if The application returns contents of arbitrary local files when traversal sequences are provided in user input

You are affected if ChapterOne version 1.7 or lower is installed AND the file inclusion functionality is exposed to unauthenticated users AND user-supplied input is not properly sanitized before being used in file inclusion operations.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade ChapterOne to a patched version if available, or implement strict input validation and whitelist-based file inclusion controls to prevent path traversal attacks.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-40731 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data