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CVE-2026-71236— Grocy: Stored XSS via HTMLPurifier Output Double-Decode

CVSS 8.7 · High
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I. Basic Information for CVE-2026-71236

Vulnerability Information
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Vulnerability Title
Grocy: Stored XSS via HTMLPurifier Output Double-Decode
Source: CVE Program / CVE List V5
Vulnerability Description
Grocy's API request-body parser (controllers/Api/BaseApiController.php, GetParsedAndFilteredRequestBody) purifies incoming field values with HTMLPurifier, then manually reverses HTML-entity encoding of the resulting output by replacing &amp;lt;, &amp;gt;, and &amp;amp; back to <, >, and & immediately after purification. This double-decode reconstructs live HTML/script tags from the entity-encoded form that HTMLPurifier produced to neutralize them, re-introducing stored XSS across API-writable fields (products, recipes, stock, users, chores, and others) that are rendered elsewhere without re-sanitization.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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

VendorProductAffected VersionsCPESubscribe
grocygrocy 0 -

II. Public POCs for CVE-2026-71236

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 6714 chars
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III. Intelligence Information for CVE-2026-71236

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Other References for CVE-2026-71236 (1)

IV. Related Vulnerabilities

Same product: grocy
Same vendor: grocy
Same weakness: CWE-79

V. Comments for CVE-2026-71236

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