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CVE-2026-65903— DOMPurify before 3.4.0 ADD_TAGS Function Bypasses FORBID_TAGS

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 3.4.0之前版本存在处理逻辑错误漏洞，该漏洞源于ADD_TAGS函数中的逻辑错误，导致短接求值允许被禁止的标签绕过FORBID_TAGS限制，攻击者可以制作包含FORBID_TAGS中列出且通过ADD_TAGS添加的标签的恶意输入，导致其在经过清理的输出中被保留。

CVSS 6.1 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

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-2026-65903

Vulnerability Information
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Vulnerability Title
DOMPurify before 3.4.0 ADD_TAGS Function Bypasses FORBID_TAGS
Source: CVE Program / CVE List V5
Vulnerability Description
DOMPurify before 3.4.0 contains a logic error in the ADD_TAGS function where short-circuit evaluation allows forbidden tags to bypass FORBID_TAGS restrictions. Attackers can craft input containing tags listed in FORBID_TAGS that are also added via ADD_TAGS function, causing them to be retained in sanitized output.
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
不充分的比较
Source: CVE Program / CVE List V5
Vulnerability Title
Cure53 DOMPurify 处理逻辑错误漏洞
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 3.4.0之前版本存在处理逻辑错误漏洞，该漏洞源于ADD_TAGS函数中的逻辑错误，导致短接求值允许被禁止的标签绕过FORBID_TAGS限制，攻击者可以制作包含FORBID_TAGS中列出且通过ADD_TAGS添加的标签的恶意输入，导致其在经过清理的输出中被保留。
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-2026-65903

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III. Intelligence Information for CVE-2026-65903

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Vendor Advisories for CVE-2026-65903 (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-2026-65911 6.1 MEDIUM DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage
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-697

V. Comments for CVE-2026-65903

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