CVE-2026-81918— Concrete CMS below 9.5.3 is vulnerable to Stored XSS via the Date Format field in the Page Attribute Display block
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.
Conrete CMS 9.5.3 之前的版本存在存储型跨站脚本（Stored XSS）漏洞，该漏洞位于“页面属性显示”区块的“日期格式”字段中。拥有 权限的用户可以存储一个恶意载荷，当任意访问者查看配置了该区块以显示日期类型属性的页面时，该载荷会在其浏览器中执行。 Concrete CMS 安全团队为该漏洞分配了 CVSS v4.0 评分 4.8，向量为：CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N。 感谢 Oriol Ortiz
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I. Basic Information for CVE-2026-81918
Vulnerability Information
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Vulnerability Title
Concrete CMS below 9.5.3 is vulnerable to Stored XSS via the Date Format field in the Page Attribute Display block
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS below 9.5.3 is vulnerable to Stored XSS via the Date Format field in the Page Attribute Display block. A user with edit_page_contents permissions could store a payload which executes in the browser of any visitor who viewed a page where the block was configured to display a date-type attribute. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 4.8 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Oriol Ortiz for reporting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/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 | 5.0.0 ~ 9.5.2 | - |
|
II. Public POCs for CVE-2026-81918
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|---|
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Vendor Pages for CVE-2026-81918 (1)
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🔗 Page Not Found :: Concrete CMS release-notes
Same Patch Batch · Concrete CMS · 2026-09-11 · 15 CVEs total
| CVE-2026-81907 | 6.1 MEDIUM | Concrete CMS 9.5.2 and below is vulnerable to Cross-Site Request Forgery (CSRF) vin Expres |
| CVE-2026-81908 | 6.0 MEDIUM | Missing Authorization in Concrete CMS 9.2.0 to 9.5.2 REST API Groups List Endpoint Allows |
| CVE-2026-18122 | 6.0 MEDIUM | Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted Express entr |
| CVE-2026-68528 | 6.0 MEDIUM | Concrete CMS 9.5.2 and below is vulnerable to Stored XSS in RSS Displayer Block via Unesca |
| CVE-2026-81909 | 5.9 MEDIUM | Concrete CMS 9 through 9.5.2 is vulnerable to Missing Authorization in the orphaned-block |
| CVE-2026-81910 | 5.9 MEDIUM | Concrete CMS 9 through 9.5.2 is vulnerable to Server-Side Template Injection (SSTI) in The |
| CVE-2026-81911 | 5.8 MEDIUM | Concrete CMS versions 9.0.0 to 9.5.2 is vulnerable to Stored XSS in Board Custom Slot save |
| CVE-2026-81912 | 5.7 MEDIUM | Concrete CMS before 9.5.3 is vulnerable to Cross-Site Request Forgery in the Move Multiple |
| CVE-2026-81913 | 5.3 MEDIUM | Concrete CMS versions 9.5.0 through 9.5.2 are vulnerable to Open Redirect via the rcURL pa |
| CVE-2026-68526 | 5.3 MEDIUM | Concrete CMS before 9.5.3 is vulnerable to CSRF in the Calendar event duplicate dialog con |
| CVE-2026-81915 | 5.1 MEDIUM | In Concrete CMS below 9.5.3, Page Type update omits object-level authorization |
| CVE-2026-81917 | 5.1 MEDIUM | Concrete CMS below 9.5.3 is vulnerable to Stored XSS in the Document Library block file de |
| CVE-2026-81916 | 5.1 MEDIUM | Incorrect Authorization in the Concrete CMS Express Entries Dashboard below version 9.5.3 |
| CVE-2026-68535 | 5.1 MEDIUM | Concrete CMS 9.2.0 to 9.5.2 is vulnerable to Missing authorization in the Concrete CMS Are |
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