CVE-2026-77939

MediumCVSS 6.5/10Last modified Sep 8, 2026

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-94 CWE-1336

Affected software

Vendor	Product	Versions
flextype	flextype	<= 1.0.0-dev; <= aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d

References

Timeline

Published: Aug 28, 2026
Last modified: Sep 8, 2026
NVD status: Deferred

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