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CVE-2026-65911— DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage

Quick assessment

Affected
cure53 DOMPurify
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.

Cure53 DOMPurify是Cure53公司开源的一款使用JavaScript编写的,用于HTML、MathML和SVG的DOM(文档对象模型)。 Cure53 DOMPurify 3.3.3及之前版本存在跨站脚本漏洞，该漏洞源于通过ADD_ATTR或ADD_TAGS提供的函数谓词在同一实例的后续sanitize()调用中持续存在于内部状态（EXTRA_ELEMENT_HANDLING），若后续调用以数组而非函数形式提供参数，则先前设置的函数处理程序未清除或覆盖，导致攻击者控制的属性或标签得以通过，

CVSS 6.1 · Medium EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
cure53 DOMPurify < 3.4.0 affected
3.4.0 unaffected
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I. Basic Information for CVE-2026-65911

Vulnerability Information
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Vulnerability Title
DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage
Source: CVE Program / CVE List V5
Vulnerability Description
In DOMPurify through 3.3.3, function predicates supplied via ADD_ATTR or ADD_TAGS to DOMPurify.sanitize() persist in internal state (EXTRA_ELEMENT_HANDLING) across subsequent sanitize() calls on the same instance. If a later call on the same instance provides ADD_ATTR or ADD_TAGS as an array rather than a function, the previously set function handler is neither cleared nor overwritten, so it continues to approve attacker-controlled attributes or tags. This can allow dangerous event-handler attributes or forbidden tags (bypassing FORBID_TAGS) to survive sanitization, resulting in cross-site scripting. The vendor (Cure53) considers this an edge case outside DOMPurify's threat model; the referenced advisory lists 3.4.0 as the patched version.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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
Vulnerability Title
Cure53 DOMPurify 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cure53 DOMPurify是Cure53公司开源的一款使用JavaScript编写的,用于HTML、MathML和SVG的DOM(文档对象模型)。 Cure53 DOMPurify 3.3.3及之前版本存在跨站脚本漏洞，该漏洞源于通过ADD_ATTR或ADD_TAGS提供的函数谓词在同一实例的后续sanitize()调用中持续存在于内部状态（EXTRA_ELEMENT_HANDLING），若后续调用以数组而非函数形式提供参数，则先前设置的函数处理程序未清除或覆盖，导致攻击者控制的属性或标签得以通过，
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cure53 DOMPurify 0 ~ 3.4.0 -

II. Public POCs for CVE-2026-65911

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III. Intelligence Information for CVE-2026-65911

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Vendor Advisories for CVE-2026-65911 (2)

Same Patch Batch · cure53 · 2026-07-23 · 11 CVEs total

CVE-2026-65898 7.2 HIGH DOMPurify before 3.4.11 Permanent Attribute Allowlist Pollution via setConfig
CVE-2026-65899 6.1 MEDIUM DOMPurify before 3.4.9 Trusted Types Policy State Contamination
CVE-2026-65901 6.1 MEDIUM DOMPurify 3.4.6 Cross-Site Scripting via IN_PLACE nodeName
CVE-2026-65900 6.1 MEDIUM DOMPurify before 3.4.8 Template Expression Injection via RETURN_DOM
CVE-2026-65912 6.1 MEDIUM DOMPurify before 3.3.2 URI Validation Bypass via ADD_ATTR
CVE-2026-65913 6.1 MEDIUM DOMPurify before 3.3.2 Prototype Pollution via USE_PROFILES
CVE-2026-65903 6.1 MEDIUM DOMPurify before 3.4.0 ADD_TAGS Function Bypasses FORBID_TAGS
CVE-2026-65902 6.1 MEDIUM DOMPurify before 3.4.7 Hook Mutation Pollution via allowedTags
CVE-2026-65914 5.3 MEDIUM DOMPurify before 3.3.2 Mutation XSS via Re-Contextualization
CVE-2026-65904 4.7 MEDIUM DOMPurify through 3.3.3 Cross-Site Scripting via IN_PLACE mode

IV. Related Vulnerabilities

Same product: DOMPurify
Same vendor: cure53
Same weakness: CWE-79

V. Comments for CVE-2026-65911

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