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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是flextype组织的一款内容管理系统。 flextype v1.0.0-dev及之前版本存在代码注入漏洞，该漏洞源于通过POST /api/v1/query端点向Symfony ExpressionLanguage引擎传递未净化用户输入，可能导致已认证攻击者利用filesystem()和serializers()等应用对象读取任意文件，并在特定条件下实现远程代码执行。

CVSS 6.5 · Medium EPSS 0.61% · P49 Updated Aug 29, 2026

Possible ATT&CK Techniques 3 AI

T1195 · Supply Chain Compromise T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

Vendor	Product	Version Range	Status
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

Vulnerability Title

flextype 代码注入漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-77939

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-77939

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Vendor Advisories for CVE-2026-77939 (1)

🔗 Flextype CMS 1.0.0-dev RCE via POST /api/v1/query Endpoint | Advisories | VulnCheck third-party-advisory

Other References for CVE-2026-77939 (1)

🔗 CVE-2026-77939: Server-Side Expression Injection in REST API · Issue #595 · flextype/flextype Read full article technical-description exploit

https://www.cve.org/CVERecord?id=CVE-2026-77939

IV. Related Vulnerabilities

Same product: flextype

Same vendor: flextype

Same weakness: CWE-94