Vulnerability-Lookup

CNVD-2026-00557

Vulnerability from cnvd - Published: 2026-01-06

Title

CMSimple代码执行漏洞

Description

CMSimple是一种自由的内容管理系统。 CMSimple存在代码执行漏洞，该漏洞源于模板编辑功能未对用户输入的代码内容进行安全控制与过滤，导致登录用户能够通过模板编辑接口将恶意PHP代码注入到模板文件中。攻击者可利用该漏洞编写反向shell等恶意载荷，并借助合法的CSRF Token，通过模板编辑端点保存恶意PHP代码。

Severity

高

Formal description

目前厂商尚未发布升级程序修复该安全问题，详情见厂商官网： https://www.cmsimple.org/

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-47735

Impacted products

Name
CMSimple CMSimple 5.4

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-47735",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-47735"
    }
  },
  "description": "CMSimple\u662f\u4e00\u79cd\u81ea\u7531\u7684\u5185\u5bb9\u7ba1\u7406\u7cfb\u7edf\u3002\n\nCMSimple\u5b58\u5728\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u6a21\u677f\u7f16\u8f91\u529f\u80fd\u672a\u5bf9\u7528\u6237\u8f93\u5165\u7684\u4ee3\u7801\u5185\u5bb9\u8fdb\u884c\u5b89\u5168\u63a7\u5236\u4e0e\u8fc7\u6ee4\uff0c\u5bfc\u81f4\u767b\u5f55\u7528\u6237\u80fd\u591f\u901a\u8fc7\u6a21\u677f\u7f16\u8f91\u63a5\u53e3\u5c06\u6076\u610fPHP\u4ee3\u7801\u6ce8\u5165\u5230\u6a21\u677f\u6587\u4ef6\u4e2d\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7f16\u5199\u53cd\u5411shell\u7b49\u6076\u610f\u8f7d\u8377\uff0c\u5e76\u501f\u52a9\u5408\u6cd5\u7684CSRF Token\uff0c\u901a\u8fc7\u6a21\u677f\u7f16\u8f91\u7aef\u70b9\u4fdd\u5b58\u6076\u610fPHP\u4ee3\u7801\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5c1a\u672a\u53d1\u5e03\u5347\u7ea7\u7a0b\u5e8f\u4fee\u590d\u8be5\u5b89\u5168\u95ee\u9898\uff0c\u8be6\u60c5\u89c1\u5382\u5546\u5b98\u7f51\uff1a\r\nhttps://www.cmsimple.org/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-00557",
  "openTime": "2026-01-06",
  "products": {
    "product": "CMSimple CMSimple 5.4"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-47735",
  "serverity": "\u9ad8",
  "submitTime": "2025-12-29",
  "title": "CMSimple\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e"
}

CVE-2021-47735 (GCVE-0-2021-47735)

Vulnerability from cvelistv5 – Published: 2025-12-23 19:34 – Updated: 2025-12-23 21:20

Title

CMSimple 5.4 Authenticated Remote Code Execution via Template Editing

Summary

CMSimple 5.4 contains an authenticated remote code execution vulnerability that allows logged-in attackers to inject malicious PHP code into template files. Attackers can exploit the template editing functionality by crafting a reverse shell payload and saving it through the template editing endpoint with a valid CSRF token.

Severity ?

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


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

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

VulnCheck

References

URL

Tags

	https://www.exploit-db.com/exploits/50356	exploit
	https://www.cmsimple.org/	product
	https://www.vulncheck.com/advisories/cmsimple-aut…	third-party-advisory

Impacted products

	Vendor	Product	Version
	Cmsimple	Cmsimple	Affected: 5.4

Credits

pussycat0x

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47735",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-23T21:20:17.086941Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-12-23T21:20:25.731Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "product": "Cmsimple",
          "vendor": "Cmsimple",
          "versions": [
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              "status": "affected",
              "version": "5.4"
            }
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        }
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "pussycat0x"
        }
      ],
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      "descriptions": [
        {
          "lang": "en",
          "value": "CMSimple 5.4 contains an authenticated remote code execution vulnerability that allows logged-in attackers to inject malicious PHP code into template files. Attackers can exploit the template editing functionality by crafting a reverse shell payload and saving it through the template editing endpoint with a valid CSRF token."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "HIGH",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
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            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
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      "problemTypes": [
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          "descriptions": [
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              "description": "Improper Control of Generation of Code (\u0027Code Injection\u0027)",
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              "type": "CWE"
            }
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      "providerMetadata": {
        "dateUpdated": "2025-12-23T19:34:09.077Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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      "references": [
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          "name": "ExploitDB-50356",
          "tags": [
            "exploit"
          ],
          "url": "https://www.exploit-db.com/exploits/50356"
        },
        {
          "name": "Official CMSimple Homepage",
          "tags": [
            "product"
          ],
          "url": "https://www.cmsimple.org/"
        },
        {
          "name": "VulnCheck Advisory: CMSimple 5.4 Authenticated Remote Code Execution via Template Editing",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/cmsimple-authenticated-remote-code-execution-via-template-editing"
        }
      ],
      "title": "CMSimple 5.4 Authenticated Remote Code Execution via Template Editing",
      "x_generator": {
        "engine": "vulncheck"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
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    "datePublished": "2025-12-23T19:34:09.077Z",
    "dateReserved": "2025-12-23T13:24:04.579Z",
    "dateUpdated": "2025-12-23T21:20:25.731Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CNVD-2026-00557

CVE-2021-47735 (GCVE-0-2021-47735)

Tags

Sightings

Nomenclature