Is CVE-2026-39387 actively exploited?

No active exploitation of CVE-2026-39387 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39387 be exploited remotely?

Yes. CVE-2026-39387 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39387?

CVE-2026-39387 has a CVSS score of 7.2 (HIGH).

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HIGH

CVE-2026-39387

CWE-98Published: April 14, 2026· Updated: Apr 17, 2026

7.2

CVSS v3.1

EPSS:0.21%probability of exploitation in 30 daysPercentile:43.7th

Official Description

BoidCMS is an open-source, PHP-based flat-file CMS for building simple websites and blogs, using JSON as its database. Versions prior to 2.1.3 are vulnerable to a critical Local File Inclusion (LFI) attack via the tpl parameter, which can lead to Remote Code Execution (RCE).The application fails to sanitize the tpl (template) parameter during page creation and updates. This parameter is passed directly to a require_once() statement without path validation. An authenticated administrator can exploit this by injecting path traversal sequences (../) into the tpl value to escape the intended theme directory and include arbitrary files — specifically, files from the server's media/ directory. When combined with the file upload functionality, this becomes a full RCE chain: an attacker can first upload a file with embedded PHP code (e.g., disguised as image data), then use the path traversal vulnerability to include that file via require_once(), executing the embedded code with web server privileges. This issue has been fixed in version 2.1.3.

NVD Source

Technical Analysis

CVE-2026-39387 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.2.