CVE-2026-41240— DOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBID_ATTR fix)
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-41240
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
DOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBID_ATTR fix)
Source: NVD (National Vulnerability Database)
Vulnerability Description
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions prior to 3.4.0 have an inconsistency between FORBID_TAGS and FORBID_ATTR handling when function-based ADD_TAGS is used. Commit c361baa added an early exit for FORBID_ATTR at line 1214. The same fix was not applied to FORBID_TAGS. At line 1118-1123, when EXTRA_ELEMENT_HANDLING.tagCheck returns true, the short-circuit evaluation skips the FORBID_TAGS check entirely. This allows forbidden elements to survive sanitization with their attributes intact. Version 3.4.0 patches the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
宽松定义的白名单
Source: NVD (National Vulnerability Database)
Vulnerability Title
DOMPurify 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DOMPurify是Cure53个人开发者的一款使用JavaScript编写的，用于HTML、MathML和SVG的DOM（文档对象模型）。 DOMPurify 3.4.0之前版本存在跨站脚本漏洞，该漏洞源于FORBID_TAGS和FORBID_ATTR处理不一致，导致禁止元素及其属性通过清理。
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
II. Public POCs for CVE-2026-41240
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-41240
请登录查看更多情报信息。
- Release DOMPurify 3.4.0 · cure53/DOMPurify · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-41240
Same Patch Batch · cure53 · 2026-04-23 · 3 CVEs total
| CVE-2026-41238 | 6.9 MEDIUM | DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback |
| CVE-2026-41239 | 6.8 MEDIUM | DOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM mode |
IV. Related Vulnerabilities
Same product: DOMPurify
- CVE-2026-41239
DOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM mode - CVE-2026-41238
DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEM - CVE-2026-0540
DOMPurify XSS via Missing Rawtext Elements in SAFE_FOR_XML - CVE-2025-15599
DOMPurify XSS via Textarea Rawtext Bypass in SAFE_FOR_XML - CVE-2025-48050
DOMPurify 安全漏洞
Same vendor: cure53
- CVE-2026-41239
DOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM mode - CVE-2026-41238
DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEM - CVE-2026-0540
DOMPurify XSS via Missing Rawtext Elements in SAFE_FOR_XML - CVE-2025-15599
DOMPurify XSS via Textarea Rawtext Bypass in SAFE_FOR_XML - CVE-2025-48050
DOMPurify 安全漏洞
Same weakness: CWE-183
- CVE-2026-44111
OpenClaw < 2026.4.15 - Arbitrary Markdown File Read via QMD - CVE-2026-43574
OpenClaw < 2026.4.12 - Improper Authorization via Empty Appr - CVE-2026-29514
NetBox 4.3.5 - 4.5.4 RCE via RenderTemplateMixin - CVE-2026-41387
OpenClaw < 2026.3.22 - Supply Chain Redirection via Incomple - CVE-2026-42042
Axios: XSRF Token Cross-Origin Leakage via Prototype Polluti
V. Comments for CVE-2026-41240
No comments yet