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CVE-2026-18117— Concrete CMS 9.0.0 to 9.5.2 is vulnerable to Stored XSS in Custom Page Alias Name

Quick assessment

Affected
Concrete CMS Concrete CMS
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.

Concrete CMS 9.0.0 至 9.5.3 版本存在存储型 XSS 漏洞，该漏洞通过自定义页面别名（customAliasName）触发。原因在于“编辑别名”对话框仅对提交的值应用了 trim() 函数，而未进行任何输入中和处理。拥有页面 write（编辑器）权限的已认证用户，可以存储一个恶意的别名名称，该名称随后在管理后台的“站点地图”面板中被未转义地渲染出来，并在任何打开该面板的管理员或编辑会话中自动执行。这使得编辑器能够借助受害者的活跃会话，将其权限提升为管理员。Concrete CMS 安全团队为

CVSS 7.3 · High

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-18117

Vulnerability Information
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Vulnerability Title
Concrete CMS 9.0.0 to 9.5.2 is vulnerable to Stored XSS in Custom Page Alias Name
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS 9.0.0 through 9.5.3 is vulnerable to stored XSS via the custom page alias name (customAliasName) because the Edit Alias dialog applied only trim() to the submitted value and performed no input neutralization. An authenticated user holding canWrite (editor) permission on a page could store a malicious alias name that was later rendered unescaped in the administrative Sitemap panel, where it executed automatically in any administrator or editor session that opened the panel, allowing an editor to escalate to administrator through the victim's active session. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N. Thanks Nguyen Manh Thuan for reporting.
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:L/SC:N/SI:N/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Concrete CMS Concrete CMS 9.0.0 ~ 9.5.2 -

II. Public POCs for CVE-2026-18117

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III. Intelligence Information for CVE-2026-18117

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Vendor Pages for CVE-2026-18117 (1)

Same Patch Batch · Concrete CMS · 2026-09-14 · 7 CVEs total

CVE-2026-81900 7.3 HIGH Concrete CMS before 9.5.3 is vulnerable to Stored XSS in the YouTube block (vWidth/vHeight
CVE-2026-18116 7.3 HIGH Concrete CMS 8.3.0 to 9.5.2 is vulnerable to Stored XSS in Calendar Event Name via Workflo
CVE-2026-81901 7.2 HIGH Concrete CMS 9.2.0 to 9.5.2 is vulnerable to stored XSS due to missing authorization in th
CVE-2026-81902 7.1 HIGH Concrete CMS 9.0.0 to 9.5.2 is vulnerable to CSRF on Orphan Block Cleanup
CVE-2026-18119 7.0 HIGH Concrete CMS below 9.5.3 is vulnerable to Stored XSS via unsanitized inline block custom s
CVE-2026-81903 7.0 HIGH Concrete CMS 9.0.0 to 9.5.2 is vulnerable to Stored XSS via Page Container icon

IV. Related Vulnerabilities

Same product: Concrete CMS
Same vendor: Concrete CMS
Same weakness: CWE-79

V. Comments for CVE-2026-18117

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