CVE-2026-27986
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 · uneditedImproper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in ThemeREX OsTende ostende allows PHP Local File Inclusion.This issue affects OsTende: from n/a through <= 1.4.3.
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 · moderate confidenceA Local File Inclusion (LFI) vulnerability in ThemeREX OsTende allows attackers to control which PHP files get included via include/require statements. This improper control of filenames stems from insufficient input validation on parameters used in PHP include functions, potentially enabling arbitrary PHP code execution if an attacker can upload or control files on the server.
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 checksWork through these to decide whether this CVE applies to you.
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Confirm ThemeREX OsTende theme is installedCheck your WordPress wp-content/themes directory for a folder named 'ostende', 'os-tende', or similar ThemeREX OsTende variant. Also check your WordPress admin dashboard under Appearance > Themes.Affected if The OsTende theme by ThemeREX is present in your WordPress installation
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Locate the theme version informationOpen the style.css file in the OsTende theme folder and look for the 'Version:' comment in the file header, or check version.php if it exists in the theme directory.Affected if The installed version cannot be verified as current or the version number is older than any available patch
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Identify file inclusion code patternsSearch all PHP files within the OsTende theme folder for include(), require(), include_once(), or require_once() function calls. Specifically look for where these functions use variables derived from $_GET, $_POST, or $_REQUEST superglobals as the file path.Affected if PHP files contain include/require statements that use user-supplied input directly as file paths without validation (such as include($_GET['file']))
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Test for vulnerable URL parametersIf file inclusion code is found using request parameters, attempt to identify the parameter name (commonly 'file', 'page', 'template', 'path', or similar). Check if these parameters can be manipulated via URL to include arbitrary PHP files.Affected if URL parameters controlling file inclusion are accessible and allow path traversal or direct file path specification without proper validation
If ThemeREX OsTende is installed and contains PHP include/require statements that directly use user-controlled input without sanitization or allowlisting, the environment is affected by this LFI vulnerability.
Generated from the published advisory. Verify against your own configuration.
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 dataImplement strict allowlist-based validation on all file inclusion parameters, sanitize path traversal sequences (../), and ensure included files come from a predefined safe directory. Consider using basename() and realpath() to validate and resolve file paths before inclusion.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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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 sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-27986 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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