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CVE-2026-107380— enshrined/svg-sanitize: Stored XSS via DTD Entity / HTML5 Named Character Reference Collision

Quick assessment

Affected
darylldoyle svg-sanitizer
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.

savg-sanitizer 是一个用于 PHP 的 SVG/XML 清理器。在 1.0.0 版本之前，svg-sanitizer 的 isHrefSafeValue() 方法会在 XML DTD 实体扩展之后验证 SVG 的 href 属性，但 saveXML() 方法在移除 DTD 声明后会保留原始的实体引用。通过构造特定的实体（例如 Tab），该实体可能使清理器误认为其是一个安全的片段前缀；然而，在后续的内联 HTML 渲染过程中，HTML5 命名字符参考解析会将残留的实体引用转换为空白字符，从而暴露出 ja

CVSS 5.4 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
darylldoyle svg-sanitizer < 1.0.0 affected
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I. Basic Information for CVE-2026-107380

Vulnerability Information
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Vulnerability Title
enshrined/svg-sanitize: Stored XSS via DTD Entity / HTML5 Named Character Reference Collision
Source: CVE Program / CVE List V5
Vulnerability Description
savg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, svg-sanitizer's isHrefSafeValue() validates an SVG href after XML DTD entity expansion, but saveXML() serializes the original entity reference after removing the DTD declaration. A crafted entity such as Tab can appear to the sanitizer as a safe fragment prefix while HTML5 Named Character Reference resolution during inline HTML rendering later converts the surviving reference to whitespace, exposing a javascript: URL. When an application embeds the sanitized SVG inline, a user who activates the link can cause script to execute in the embedding page's origin. This issue is fixed in version 1.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
darylldoyle svg-sanitizer < 1.0.0 -

II. Public POCs for CVE-2026-107380

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III. Intelligence Information for CVE-2026-107380

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Patches & Fixes for CVE-2026-107380 (1)

Other References for CVE-2026-107380 (2)

IV. Related Vulnerabilities

Same product: svg-sanitizer
Same vendor: darylldoyle
Same weakness: CWE-79

V. Comments for CVE-2026-107380

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