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CVE-2026-77939— Flextype CMS 1.0.0-dev RCE via POST /api/v1/query Endpoint

Quick assessment

Affected
flextype flextype
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Flextype CMS 在 v1.0.0-dev 及更早版本中存在表达式语言注入漏洞。持有有效 API 令牌的认证攻击者可以通过 POST /api/v1/query 端点，将未经过滤的用户输入传递给 Symfony ExpressionLanguage 引擎，从而读取任意文件。攻击者可以利用评估作用域中暴露的应用对象（包括 filesystem() 和 serializers()）来读取服务器上的任意文件；如果能够通过次要向量将 PHP 文件写入磁盘，则可进一步实现有条件的远程代码执行（RCE）。

CVSS 6.5 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
flextype flextype ≤ 1.0.0-dev affected
≤ aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d affected
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I. Basic Information for CVE-2026-77939

Vulnerability Information
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Vulnerability Title
Flextype CMS 1.0.0-dev RCE via POST /api/v1/query Endpoint
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
flextype flextype 0 ~ 1.0.0-dev -

II. Public POCs for CVE-2026-77939

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III. Intelligence Information for CVE-2026-77939

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Vendor Advisories for CVE-2026-77939 (1)

Other References for CVE-2026-77939 (1)

IV. Related Vulnerabilities

Same weakness: CWE-94

V. Comments for CVE-2026-77939

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