Vulnerability-Lookup

CVE-2026-59167 (GCVE-0-2026-59167)

Vulnerability from cvelistv5 – Published: 2026-09-23 13:52 – Updated: 2026-09-24 14:52

Title

SunEditor: Critical XSS vulnerability - sanitizer bypass

Summary

SunEditor is a lightweight and powerful WYSIWYG editor in vanilla JavaScript with no dependencies. Prior to 2.47.11, the sanitizer in src/lib/core.js does not consistently reject namespaced or custom HTML elements, allowing event-handler attributes to remain on crafted elements. When an application renders attacker-controlled editor content and a user interacts with the element, the retained handler can execute script in the application's browser origin, enabling stored cross-site scripting, data exposure, or unauthorized browser-context actions. This issue is fixed in version 2.47.11.

Severity

10 (Critical)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-24 14:24 UTC

CWE

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

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/JiHong88/suneditor/security/ad…	x_refsource_CONFIRM
https://github.com/JiHong88/suneditor/issues/1646	x_refsource_MISC
https://github.com/JiHong88/suneditor/commit/a94a…	x_refsource_MISC
https://github.com/JiHong88/suneditor/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
JiHong88	suneditor	Affected: < 2.47.11	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-59167

Vulnerability from fkie_nvd - Published: 2026-09-23 14:17 - Updated: 2026-09-23 18:12

Severity

10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/JiHong88/suneditor/commit/a94ace269c7102bfb6de58a27a6547bc4eb09045
	security-advisories@github.com	https://github.com/JiHong88/suneditor/issues/1646
	security-advisories@github.com	https://github.com/JiHong88/suneditor/releases/tag/2.47.11
	security-advisories@github.com	https://github.com/JiHong88/suneditor/security/advisories/GHSA-6rf4-v2fh-m6p4

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "suneditor",
          "vendor": "JiHong88",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.47.11"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
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  "descriptions": [
    {
      "lang": "en",
      "value": "SunEditor is a lightweight and powerful WYSIWYG editor in vanilla JavaScript with no dependencies. Prior to 2.47.11, the sanitizer in src/lib/core.js does not consistently reject namespaced or custom HTML elements, allowing event-handler attributes to remain on crafted elements. When an application renders attacker-controlled editor content and a user interacts with the element, the retained handler can execute script in the application\u0027s browser origin, enabling stored cross-site scripting, data exposure, or unauthorized browser-context actions. This issue is fixed in version 2.47.11."
    }
  ],
  "id": "CVE-2026-59167",
  "lastModified": "2026-09-23T18:12:04.247",
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        "cvssData": {
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          "attackVector": "NETWORK",
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          "baseScore": 10.0,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 3.9,
        "impactScore": 6.0,
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        "type": "Secondary"
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  "published": "2026-09-23T14:17:07.923",
  "references": [
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      "source": "security-advisories@github.com",
      "url": "https://github.com/JiHong88/suneditor/commit/a94ace269c7102bfb6de58a27a6547bc4eb09045"
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      "source": "security-advisories@github.com",
      "url": "https://github.com/JiHong88/suneditor/issues/1646"
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      "url": "https://github.com/JiHong88/suneditor/releases/tag/2.47.11"
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GHSA-6RF4-V2FH-M6P4

Vulnerability from github – Published: 2026-09-24 14:57 – Updated: 2026-09-24 14:57

Summary

SunEditor: Critical XSS vulnerability - sanitizer bypass

Details

Summary

SUNEDITOR v2.47.10 appears to allow JavaScript execution through crafted namespaced HTML elements.

The sanitization logic does not fully remove executable event-handler attributes from certain custom/namespaced tags. As a result, an attacker may be able to inject HTML content that executes JavaScript when the rendered element is interacted with.

This behavior was observed after the changes introduced in this commit:

https://github.com/JiHong88/suneditor/commit/9ed405fb0de676e56cd0e6a13c19c103ad5948d3

Affected Version

Confirmed vulnerable:

SUNEDITOR =< 2.47.10

Potentially affected:

Previous versions, if the same sanitization logic is still present

Proof of Concept

The following payload preserves an executable event handler:

<a:b src="/x"><iframe src=javascript:alert(1)></iframe></a:b>

<p><a:b src="/x" onclick="document.body.style.background='red'">click</a:b></p>

Simplified PoC:

<a:b src="/x" onclick="console.log('XSS:',document.domain,document.cookie)">click</a:b>

<p><a:b src="/x" onmouseover="alert('XSS — '+document.domain)">📎 Click here for solutions</a:b></p>

Steps to Reproduce

Open SUNEDITOR using version 2.47.10.
Insert the payload above into the editor.
Save or render the generated content.
Click the generated element.
Observe that JavaScript is executed.

Impact

This may allow an attacker to inject arbitrary JavaScript into rendered editor content.

Depending on how SUNEDITOR is integrated into an application, this could lead to:

Stored XSS
DOM manipulation
Session theft
Credential theft
Account takeover actions performed in the victim’s browser context

Technical Details

The issue appears to be related to incomplete handling of namespaced/custom HTML elements such as:

<a:b>

Event-handler attributes such as onclick can remain attached to these crafted elements and execute when interacted with.

This suggests that the sanitization process may not consistently normalize and validate custom or namespaced elements before applying attribute filtering.

Suggested Remediation

Possible mitigations include:

Normalize DOM elements before sanitization.
Explicitly reject or unwrap unknown/custom/namespaced tags.
Strip all event-handler attributes from all elements, including unknown/custom elements.
Re-validate sanitized output after browser DOM parsing.
Add regression tests for namespaced/custom tag payloads.

Severity

10.0 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.47.10"
      },
      "package": {
        "ecosystem": "npm",
        "name": "suneditor"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.47.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-59167"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-24T14:57:55Z",
    "nvd_published_at": "2026-09-23T14:17:07Z",
    "severity": "CRITICAL"
  },
  "details": "## Summary\n\nSUNEDITOR `v2.47.10` appears to allow JavaScript execution through crafted namespaced HTML elements.\n\nThe sanitization logic does not fully remove executable event-handler attributes from certain custom/namespaced tags. As a result, an attacker may be able to inject HTML content that executes JavaScript when the rendered element is interacted with.\n\nThis behavior was observed after the changes introduced in this commit:\n\nhttps://github.com/JiHong88/suneditor/commit/9ed405fb0de676e56cd0e6a13c19c103ad5948d3\n\n---\n\n## Affected Version\n\nConfirmed vulnerable:\n\n* SUNEDITOR =\u003c `2.47.10`\n\nPotentially affected:\n\n* Previous versions, if the same sanitization logic is still present\n\n---\n\n## Proof of Concept\n\nThe following payload preserves an executable event handler:\n\n```html\n\u003ca:b src=\"/x\"\u003e\u003ciframe src=javascript:alert(1)\u003e\u003c/iframe\u003e\u003c/a:b\u003e\n\n\u003cp\u003e\u003ca:b src=\"/x\" onclick=\"document.body.style.background=\u0027red\u0027\"\u003eclick\u003c/a:b\u003e\u003c/p\u003e\n```\n\nSimplified PoC:\n\n```html\n\u003ca:b src=\"/x\" onclick=\"console.log(\u0027XSS:\u0027,document.domain,document.cookie)\"\u003eclick\u003c/a:b\u003e\n```\n\n```html\n\u003cp\u003e\u003ca:b src=\"/x\" onmouseover=\"alert(\u0027XSS \u2014 \u0027+document.domain)\"\u003e\ud83d\udcce Click here for solutions\u003c/a:b\u003e\u003c/p\u003e\n```\n---\n\n## Steps to Reproduce\n\n1. Open SUNEDITOR using version `2.47.10`.\n2. Insert the payload above into the editor.\n3. Save or render the generated content.\n4. Click the generated element.\n5. Observe that JavaScript is executed.\n\n---\n\n## Impact\n\nThis may allow an attacker to inject arbitrary JavaScript into rendered editor content.\n\nDepending on how SUNEDITOR is integrated into an application, this could lead to:\n\n* Stored XSS\n* DOM manipulation\n* Session theft\n* Credential theft\n* Account takeover actions performed in the victim\u2019s browser context\n\n---\n\n## Technical Details\n\nThe issue appears to be related to incomplete handling of namespaced/custom HTML elements such as:\n\n```html\n\u003ca:b\u003e\n```\n\nEvent-handler attributes such as `onclick` can remain attached to these crafted elements and execute when interacted with.\n\nThis suggests that the sanitization process may not consistently normalize and validate custom or namespaced elements before applying attribute filtering.\n\n---\n\n## Suggested Remediation\n\nPossible mitigations include:\n\n* Normalize DOM elements before sanitization.\n* Explicitly reject or unwrap unknown/custom/namespaced tags.\n* Strip all event-handler attributes from all elements, including unknown/custom elements.\n* Re-validate sanitized output after browser DOM parsing.\n* Add regression tests for namespaced/custom tag payloads.\n\n---",
  "id": "GHSA-6rf4-v2fh-m6p4",
  "modified": "2026-09-24T14:57:55Z",
  "published": "2026-09-24T14:57:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/JiHong88/suneditor/security/advisories/GHSA-6rf4-v2fh-m6p4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59167"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JiHong88/suneditor/issues/1646"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JiHong88/suneditor/commit/a94ace269c7102bfb6de58a27a6547bc4eb09045"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/JiHong88/suneditor"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JiHong88/suneditor/releases/tag/2.47.11"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SunEditor: Critical XSS vulnerability - sanitizer bypass"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-59167 (GCVE-0-2026-59167)

FKIE_CVE-2026-59167

GHSA-6RF4-V2FH-M6P4

Summary

Affected Version

Proof of Concept

Steps to Reproduce

Impact

Technical Details

Suggested Remediation

Tags

Sightings

Nomenclature

Related by attack behaviour