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CVE-2026-18430— HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason

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，该漏洞源于评论删除通知流程存在存储型跨站脚本漏洞，空间管理员可删除其他用户的评论并选择通知原作者，在删除原因中放置HTML/JavaScript。

CVSS 7.2 · High EPSS 0.37% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
HumHub HumHub 1.18.4 affected
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I. Basic Information for CVE-2026-18430

Vulnerability Information
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Vulnerability Title
HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason
Source: CVE Program / CVE List V5
Vulnerability Description
HumHub 1.18.4 contains a stored cross-site scripting vulnerability in the comment-deletion notification flow. A Space administrator can delete another user's comment, choose to notify the original author, and place HTML/JavaScript in the deletion reason.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/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，该漏洞源于评论删除通知流程存在存储型跨站脚本漏洞，空间管理员可删除其他用户的评论并选择通知原作者，在删除原因中放置HTML/JavaScript。
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-2026-18430

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III. Intelligence Information for CVE-2026-18430

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Patches & Fixes for CVE-2026-18430 (1)

Vendor Advisories for CVE-2026-18430 (1)

Vendor Pages for CVE-2026-18430 (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-2026-18756 7.2 HIGH HumHub Community Edition 1.18.4-pl1 - Reflected XSS in Space membership request button ren

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-18430

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