Vulnerability-Lookup

CNVD-2026-23810

Vulnerability from cnvd - Published: 2026-06-12

Title

WordPress插件Custom Block Builder跨站脚本漏洞

Description

WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress插件Custom Block Builder存在跨站脚本漏洞，该漏洞源于未在所有写入块模板代码字段的路径中一致检查unfiltered_html能力，攻击者可利用该漏洞导致多站点安装或定义了DISALLOW_UNFILTERED_HTML的单站点安装的管理员注入任意JavaScript，在访问嵌入受影响块的页面的用户浏览器中执行。

Severity

低

Patch Name

WordPress插件Custom Block Builder跨站脚本漏洞的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-8981

Impacted products

Name
WordPress Custom Block Builder <4.3.0

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-8981",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-8981"
    }
  },
  "description": "WordPress\u662f\u4e00\u5957\u4f7f\u7528PHP\u8bed\u8a00\u5f00\u53d1\u7684\u535a\u5ba2\u5e73\u53f0\u3002\u8be5\u5e73\u53f0\u5177\u6709\u5728\u57fa\u4e8ePHP\u548cMySQL\u7684\u670d\u52a1\u5668\u4e0a\u67b6\u8bbe\u4e2a\u4eba\u535a\u5ba2\u7f51\u7ad9\u7684\u529f\u80fd\u3002WordPress plugin\u662f\u4e00\u4e2a\u5e94\u7528\u63d2\u4ef6\u3002\n\nWordPress\u63d2\u4ef6Custom Block Builder\u5b58\u5728\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u672a\u5728\u6240\u6709\u5199\u5165\u5757\u6a21\u677f\u4ee3\u7801\u5b57\u6bb5\u7684\u8def\u5f84\u4e2d\u4e00\u81f4\u68c0\u67e5unfiltered_html\u80fd\u529b\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u591a\u7ad9\u70b9\u5b89\u88c5\u6216\u5b9a\u4e49\u4e86DISALLOW_UNFILTERED_HTML\u7684\u5355\u7ad9\u70b9\u5b89\u88c5\u7684\u7ba1\u7406\u5458\u6ce8\u5165\u4efb\u610fJavaScript\uff0c\u5728\u8bbf\u95ee\u5d4c\u5165\u53d7\u5f71\u54cd\u5757\u7684\u9875\u9762\u7684\u7528\u6237\u6d4f\u89c8\u5668\u4e2d\u6267\u884c\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-23810",
  "openTime": "2026-06-12",
  "patchDescription": "WordPress\u662f\u4e00\u5957\u4f7f\u7528PHP\u8bed\u8a00\u5f00\u53d1\u7684\u535a\u5ba2\u5e73\u53f0\u3002\u8be5\u5e73\u53f0\u5177\u6709\u5728\u57fa\u4e8ePHP\u548cMySQL\u7684\u670d\u52a1\u5668\u4e0a\u67b6\u8bbe\u4e2a\u4eba\u535a\u5ba2\u7f51\u7ad9\u7684\u529f\u80fd\u3002WordPress plugin\u662f\u4e00\u4e2a\u5e94\u7528\u63d2\u4ef6\u3002\r\n\r\nWordPress\u63d2\u4ef6Custom Block Builder\u5b58\u5728\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u672a\u5728\u6240\u6709\u5199\u5165\u5757\u6a21\u677f\u4ee3\u7801\u5b57\u6bb5\u7684\u8def\u5f84\u4e2d\u4e00\u81f4\u68c0\u67e5unfiltered_html\u80fd\u529b\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u591a\u7ad9\u70b9\u5b89\u88c5\u6216\u5b9a\u4e49\u4e86DISALLOW_UNFILTERED_HTML\u7684\u5355\u7ad9\u70b9\u5b89\u88c5\u7684\u7ba1\u7406\u5458\u6ce8\u5165\u4efb\u610fJavaScript\uff0c\u5728\u8bbf\u95ee\u5d4c\u5165\u53d7\u5f71\u54cd\u5757\u7684\u9875\u9762\u7684\u7528\u6237\u6d4f\u89c8\u5668\u4e2d\u6267\u884c\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "WordPress\u63d2\u4ef6Custom Block Builder\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "WordPress Custom Block Builder \u003c4.3.0"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-8981",
  "serverity": "\u4f4e",
  "submitTime": "2026-06-10",
  "title": "WordPress\u63d2\u4ef6Custom Block Builder\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e"
}

CVE-2026-8981 (GCVE-0-2026-8981)

Vulnerability from cvelistv5 – Published: 2026-06-09 06:00 – Updated: 2026-06-09 10:32

Title

Lazy Blocks < 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML

Summary

The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block.

Severity

3.5 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-79 Cross-Site Scripting (XSS)
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

WPScan

References

1 reference

URL	Tags
https://wpscan.com/vulnerability/9815b0e6-e411-4a…	exploitvdb-entrytechnical-description

Impacted products

1 product

Vendor	Product	Version
Unknown	Custom Block Builder	Affected: 0 , < 4.3.0 (semver)

Credits

Luca Jungnickel WPScan

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 3.5,
              "baseSeverity": "LOW",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "HIGH",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-8981",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-09T10:32:46.274624Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-79",
                "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-09T10:32:50.766Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Custom Block Builder",
          "vendor": "Unknown",
          "versions": [
            {
              "lessThan": "4.3.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Luca Jungnickel"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "WPScan"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Custom Block Builder  WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-79 Cross-Site Scripting (XSS)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T06:00:09.486Z",
        "orgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
        "shortName": "WPScan"
      },
      "references": [
        {
          "tags": [
            "exploit",
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Lazy Blocks \u003c 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML",
      "x_generator": {
        "engine": "WPScan CVE Generator"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
    "assignerShortName": "WPScan",
    "cveId": "CVE-2026-8981",
    "datePublished": "2026-06-09T06:00:09.486Z",
    "dateReserved": "2026-05-19T13:11:53.990Z",
    "dateUpdated": "2026-06-09T10:32:50.766Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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-2026-23810

CVE-2026-8981 (GCVE-0-2026-8981)

Tags

Sightings

Nomenclature