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CVE-2026-18756— HumHub Community Edition 1.18.4-pl1 - Reflected XSS in Space membership request button rendering

Quick assessment

Affected
HumHub HumHub
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.

HumHub是HumHub组织开源的一个企业社交网络协作平台。 HumHub 1.18.4版本存在跨站脚本漏洞，该漏洞源于对space/membership/request-membership-form中options查询字符串参数的按钮配置验证不当，可能导致反射型跨站脚本攻击。

CVSS 7.2 · High EPSS 0.34% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
HumHub HumHub 1.18.4 affected
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I. Basic Information for CVE-2026-18756

Vulnerability Information
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Vulnerability Title
HumHub Community Edition 1.18.4-pl1 - Reflected XSS in Space membership request button rendering
Source: CVE Program / CVE List V5
Vulnerability Description
HumHub Community Edition 1.18.4 contains a reflected cross-site scripting vulnerability in the Space membership-request workflow. An attacker can place attacker-controlled button configuration in the options query-string parameter of space/membership/request-membership-form, lure an authenticated non-member into submitting the legitimate membership request form, and cause the server to return JavaScript containing attacker-controlled code.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA: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
HumHub 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HumHub是HumHub组织开源的一个企业社交网络协作平台。 HumHub 1.18.4版本存在跨站脚本漏洞，该漏洞源于对space/membership/request-membership-form中options查询字符串参数的按钮配置验证不当，可能导致反射型跨站脚本攻击。
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
HumHub HumHub 1.18.4 -

II. Public POCs for CVE-2026-18756

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III. Intelligence Information for CVE-2026-18756

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Patches & Fixes for CVE-2026-18756 (1)

Vendor Advisories for CVE-2026-18756 (1)

Vendor Pages for CVE-2026-18756 (1)

Same Patch Batch · HumHub · 2026-08-19 · 3 CVEs total

CVE-2026-18526 7.4 HIGH HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmation
CVE-2026-18430 7.2 HIGH HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrat

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-18756

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