CVE-2025-65602

CriticalRCE

Published: 10 December 2025

Published

10 December 2025

Modified

18 December 2025

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0007 20.5th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-65602 is a critical-severity Code Injection (CWE-94) vulnerability in Chancms Chancms. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 20.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-14 (Permitted Actions Without Identification or Authentication) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly mandates timely remediation of the specific template injection flaw in ChanCMS v3.3.4 to prevent arbitrary code execution.

SI-10 Information Input Validation good match

prevent

Requires validation of POST request inputs to the /vip/v1/file/save endpoint to block crafted payloads causing template injection.

AC-14 Permitted Actions Without Identification or Authentication good match

prevent

Restricts or safeguards unauthenticated actions on the vulnerable /vip/v1/file/save endpoint to prevent exploitation by network-accessible attackers.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

The vulnerability is an unauthenticated template injection in a public-facing web application component (/vip/v1/file/save) enabling remote code execution via crafted POST request, directly mapping to exploitation of public-facing applications.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

A template injection vulnerability in the /vip/v1/file/save component of ChanCMS v3.3.4 allows attackers to execute arbitrary code via a crafted POST request.

Deeper analysisAI

CVE-2025-65602 is a template injection vulnerability in the /vip/v1/file/save component of ChanCMS version 3.3.4. Published on 2025-12-10, it enables attackers to execute arbitrary code through a crafted POST request. The issue carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) and is linked to CWE-94 (code injection) and CWE-1336 (incorrect handling of code blocks in templates).

Any unauthenticated attacker with network access can exploit this vulnerability due to its low attack complexity and lack of requirements for privileges or user interaction. Exploitation via a specially crafted POST request to the affected endpoint results in remote code execution, providing high-impact access to compromise confidentiality, integrity, and availability of the targeted ChanCMS instance.

Advisories and further details are available in the ChanCMS repository at https://gitee.com/chancms/ChanCMS and the Notion page describing the unauthenticated RCE at https://www.notion.so/ChanCMS-Unauthenticated-RCE-2a3ee9235ba380fc9973e16c06258689.