CVE-2026-124492— SunEditor before 3.4.0 Stored XSS via Link Modal Bookmark List

Quick assessment

Affected

JiHong88 suneditor

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SunEditor 3.4.0 之前的版本在的功能中存在一个存储型跨站脚本（Stored XSS）漏洞。该漏洞源于将经过实体解码的 h1 至 h6 标题的内容，未经转义便通过插入到书签列表中。攻击者可在编辑器的标题中存储经过 HTML 编码的恶意载荷；当受害者打开链接模态框并在 URL 输入框中输入时，这些载荷便会执行 JavaScript 代码。

CVSS 7.6 · High Updated Nov 08, 2026

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

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Vulnerability Information

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Vulnerability Title

SunEditor before 3.4.0 Stored XSS via Link Modal Bookmark List

Source: CVE Program / CVE List V5

Vulnerability Description

SunEditor before 3.4.0 contains a stored cross-site scripting vulnerability in ModalAnchorEditor's #createBookmarkList, which inserts entity-decoded h1-h6 header textContent into the bookmark list via innerHTML without escaping. Attackers can store HTML-encoded payloads in editor headers that execute JavaScript when a victim opens the link modal and types # in the URL input.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
JiHong88	suneditor	0 ~ 3.4.0	-

II. Public POCs for CVE-2026-124492

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-124492

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Other References for CVE-2026-124492 (2)

https://github.com/JiHong88/suneditor/security/advisories/GHSA-5pp5-5qrp-vq56 vendor-advisory
https://www.vulncheck.com/advisories/suneditor-before-3.4.0-stored-xss-via-link-modal-bookmark-list third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-124492

Same Patch Batch · JiHong88 · 2026-11-08 · 5 CVEs total

CVE-2026-124493	9.3 CRITICAL	SunEditor before 3.4.0 Stored XSS via DocumentType Header textContent
CVE-2026-124494	9.3 CRITICAL	SunEditor before 3.4.0 Stored XSS via &colon; Entity Sanitizer Bypass
CVE-2026-124491	6.4 MEDIUM	SunEditor before 3.4.0 Stored XSS via FileUpload Plugin Filename
CVE-2026-124422	6.1 MEDIUM	SunEditor 3.0.0 before 3.4.0 Stored XSS via html.clean() Iframe Placeholder

IV. Related Vulnerabilities

Same product: suneditor

Same vendor: JiHong88

Same weakness: CWE-79