CVE-2026-85386— Concrete CMS before 9.5.4 stored is vulneratble to cross-site scripting via unauthenticated XML/XSLT file upload in the Form Block
一分钟漏洞结论
影响对象
Concrete CMS Concrete CMS
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Concrete CMS before 9.5.4 did not sanitize XML and XSLT documents uploaded through a public Form Block file-upload question. Plain XML uploads were validated by file extension only and stored as publicly accessible files that were served inline from the applic
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一、 漏洞 CVE-2026-85386 基础信息
漏洞信息
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Vulnerability Title
Concrete CMS before 9.5.4 stored is vulneratble to cross-site scripting via unauthenticated XML/XSLT file upload in the Form Block
来源: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS before 9.5.4 did not sanitize XML and XSLT documents uploaded through a public Form Block file-upload question. Plain XML uploads were validated by file extension only and stored as publicly accessible files that were served inline from the application's own origin. An unauthenticated visitor could therefore store an XML document containing an xml-stylesheet processing instruction that referenced an attacker-supplied, same-origin XSLT stylesheet. When a victim opened the stored file directly in a browser, the browser fetched the stylesheet, transformed the document into HTML, and executed attacker-controlled JavaScript in the Concrete CMS origin (stored cross-site scripting). If the victim was an authenticated administrator, the script could act with that administrator's session, and the reporter demonstrated creation of a new user in the Administrators group. 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:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Valentin SARRE (Independent security researcher) for reporting.
来源: 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:H/SC:N/SI:N/SA:N
来源: 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)
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Concrete CMS | Concrete CMS | 5.0.0 ~ 9.5.3 | - |
|
二、漏洞 CVE-2026-85386 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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CVE-2026-85386 其他参考 (1)
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Page Not Found :: Concrete CMS release-notes
同批安全公告 · Concrete CMS · 2026-09-16 · 共 6 条
| CVE-2026-85385 | 7.7 HIGH | Concrete CMS below 9.5.4 is vulnerable to Stored XSS via User Timezone Field |
| CVE-2026-18120 | 6.3 MEDIUM | Missing Authorization in legacy Express entries search endpoint allows disclosure of Expre |
| CVE-2026-87028 | 5.3 MEDIUM | Cross-Board IDOR in the Board Custom Slot Preview in Concrete CMS 9.0.0 through 9.5.3 Disc |
| CVE-2026-87031 | 2.1 LOW | Missing authorization in the REST API user creation endpoint in Concrete CMS 9.2.0 through |
| CVE-2026-85387 | 2.0 LOW | Concrete CMS before 9.5.4 allows a deactivated user to retain OAuth-authenticated REST API |
IV. Related Vulnerabilities
Same product: Concrete CMS
-
CVE-2026-18120
Missing Authorization in legacy Express entries search endpo -
CVE-2026-85387
Concrete CMS before 9.5.4 allows a deactivated user to retai -
CVE-2026-87031
Missing authorization in the REST API user creation endpoint -
CVE-2026-87028
Cross-Board IDOR in the Board Custom Slot Preview in Concret -
CVE-2026-85385
Concrete CMS below 9.5.4 is vulnerable to Stored XSS via Use
Same vendor: Concrete CMS
-
CVE-2026-18120
Missing Authorization in legacy Express entries search endpo -
CVE-2026-85387
Concrete CMS before 9.5.4 allows a deactivated user to retai -
CVE-2026-87031
Missing authorization in the REST API user creation endpoint -
CVE-2026-87028
Cross-Board IDOR in the Board Custom Slot Preview in Concret -
CVE-2026-85385
Concrete CMS below 9.5.4 is vulnerable to Stored XSS via Use
Same weakness: CWE-79
V. Comments for CVE-2026-85386
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