SEPTEMBER 17, 2026
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Case File

CVE-2026-77939

MEDIUM · CVSS 6.5 EPSS 0.44% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-28 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

Flextype CMS versions up to 1.0.0-dev are vulnerable to an expression language injection that enables authenticated attackers with a valid API token to exploit the Symfony ExpressionLanguage engine via the POST /api/v1/query endpoint. This vulnerability allows unauthorized file access and could lead to conditional remote code execution if a PHP file is uploaded through another vector. Organizations using Flextype CMS should prioritize patching this vulnerability to mitigate potential data breaches and system compromise.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
remote code execution code execution
GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-77939
Severity
MEDIUM
CVSS
6.5
EPSS
0.44%

Original NVD Description

Flextype CMS through v1.0.0-dev contains an expression language injection vulnerability that allows authenticated attackers with a valid API token to read arbitrary files by passing unsanitized user-supplied input to the Symfony ExpressionLanguage engine via the POST /api/v1/query endpoint. Attackers can leverage exposed application objects including filesystem() and serializers() within the evaluation scope to read arbitrary server files and achieve conditional remote code execution if a PHP file can be placed on disk through a secondary vector.