CVE-2026-124422

Description

SunEditor from 3.0.0 before 3.4.0 contains a stored cross-site scripting vulnerability in html.clean() that rebuilds iframes from data-se-iframe-holder-attrs JSON without filtering srcdoc or uppercase SRC keys. Attackers can inject crafted HTML through paste, html.set, or html.insert to execute script in the host page origin when victims load or paste the content.

Overview

State: PUBLISHED
Assigner (CNA): VulnCheck
CVSS severity: MEDIUM
CVSS score: 5.3 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Effective score: 5.3 / 10 MEDIUM source: CNA overview
CWE(s): CWE-79
Reserved: 2026-11-08
Published: 2026-11-08 01:38 UTC
Last updated: 2026-11-08 01:38 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/124xxx/CVE-2026-124422.json

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-119376

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Affected products (1)

Vendor	Product	Versions	Platforms
jihong88	suneditor	`3.0.0` (affected)	—

Vendor references (5)

References embedded in the original CVE record by the assigning CNA.

GitHub Security Advisory (GHSA-q867-q2hw-f8gp) vendor-advisory
https://github.com/JiHong88/suneditor/commit/57db24ac218cd10942fed0bb8288e9cb40b334bb patch
suneditor 3.4.0 Release Notes release-notes
https://github.com/JiHong88/suneditor/blob/3.3.3/src/core/logic/dom/html.js#L336-L350 technical-description
VulnCheck Advisory: SunEditor 3.0.0 before 3.4.0 Stored XSS via html.clean() Iframe Placeholder third-party-advisory

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-124422.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/suneditor",
          "product": "suneditor",
          "repo": "https://github.com/JiHong88/suneditor",
          "vendor": "jihong88",
          "versions": [
            {
              "lessThan": "3.4.0",
              "status": "affected",
              "version": "3.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "kemrec"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "manus-pi"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "EclipsSec"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Zachariah Mithani (AploSec)"
        }
      ],
      "datePublic": "2026-10-23T18:49:04.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "SunEditor from 3.0.0 before 3.4.0 contains a stored cross-site scripting vulnerability in html.clean() that rebuilds iframes from data-se-iframe-holder-attrs JSON without filtering srcdoc or uppercase SRC keys. Attackers can inject crafted HTML through paste, html.set, or html.insert to execute script in the host page origin when victims load or paste the content."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-08T01:38:41.148Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-q867-q2hw-f8gp)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/JiHong88/suneditor/security/advisories/GHSA-q867-q2hw-f8gp"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/JiHong88/suneditor/commit/57db24ac218cd10942fed0bb8288e9cb40b334bb"
        },
        {
          "name": "suneditor 3.4.0 Release Notes",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/JiHong88/suneditor/releases/tag/3.4.0"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/JiHong88/suneditor/blob/3.3.3/src/core/logic/dom/html.js#L336-L350"
        },
        {
          "name": "VulnCheck Advisory: SunEditor 3.0.0 before 3.4.0 Stored XSS via html.clean() Iframe Placeholder",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/suneditor-3.0.0-before-3.4.0-stored-xss-via-html-clean-iframe-placeholder"
        }
      ],
      "title": "SunEditor 3.0.0 before 3.4.0 Stored XSS via html.clean() Iframe Placeholder",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-124422",
    "datePublished": "2026-11-08T01:38:41.148Z",
    "dateReserved": "2026-11-08T00:57:59.205Z",
    "dateUpdated": "2026-11-08T01:38:41.148Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}