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CVE-2026-44644— LiquidJS's strip_html filter bypass via newline characters in HTML tags enables XSS

Quick assessment

Affected
harttle liquidjs
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.

harttle liquidjs是harttle的嵌入式Web服务器。 harttle liquidjs 10.25.7及之前版本存在跨站脚本漏洞，该漏洞源于strip_html过滤器逻辑缺陷，正则表达式未匹配换行符导致HTML标签绕过清理，可能造成跨站脚本攻击。

CVSS 6.1 · Medium EPSS 0.36% · P28

Affected Version Matrix 1

VendorProduct Version RangeStatus
harttle liquidjs < 10.26.0 affected
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I. Basic Information for CVE-2026-44644

Vulnerability Information
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Vulnerability Title
LiquidJS's strip_html filter bypass via newline characters in HTML tags enables XSS
Source: CVE Program / CVE List V5
Vulnerability Description
LiquidJS is a Shopify/GitHub Pages compatible template engine written in pure JavaScript. Versions 10.25.7 and below are vulnerable to XSS through a flaw in the strip_html filter logic. The strip_html filter is intended to remove HTML tags from a string before rendering, and is widely used as an XSS sanitizer. The implementation uses a regex whose catch-all branch (<.*?>) does not match line terminators, so any HTML tag containing a \n or \r character passes through unmodified. An attacker who can place a newline inside a tag (e.g. <img\nsrc=x\nonerror=alert(1)>) bypasses sanitization entirely, since browsers treat newlines as whitespace within a tag and execute the resulting onerror/onload/etc. handler. Exploitation is possible for applications that both render attacker-controlled strings via {{ x | strip_html }} to defend against HTML injection and do not separately HTML-escape that output (default behavior — outputEscape is unset by default). This issue has been fixed in version 10.26.0.
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
harttle liquidjs 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
harttle liquidjs是harttle的嵌入式Web服务器。 harttle liquidjs 10.25.7及之前版本存在跨站脚本漏洞，该漏洞源于strip_html过滤器逻辑缺陷，正则表达式未匹配换行符导致HTML标签绕过清理，可能造成跨站脚本攻击。
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
harttle liquidjs < 10.26.0 -

II. Public POCs for CVE-2026-44644

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III. Intelligence Information for CVE-2026-44644

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Patches & Fixes for CVE-2026-44644 (1)

Vendor Advisories for CVE-2026-44644 (1)

Vendor Pages for CVE-2026-44644 (1)

Same Patch Batch · harttle · 2026-06-17 · 5 CVEs total

CVE-2026-45617 7.5 HIGH LiquidJS: ReDoS via Quadratic Backtracking in `strip_html` Filter Regex
CVE-2026-45357 7.5 HIGH LiquidJS: Memory and render limit bypass via unbounded width padding in `date` filter (str
CVE-2026-44645 6.5 MEDIUM LiquidJS has a renderLimit DoS guard bypass via empty `{% for %}` body
CVE-2026-44646 5.3 MEDIUM LiquidJS: `{% render %}` tag silently bypasses per-render `ownPropertyOnly:true` via `Cont

IV. Related Vulnerabilities

Same product: liquidjs
Same vendor: harttle
Same weakness: CWE-79

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