CVE-2026-85385— Concrete CMS below 9.5.4 is vulnerable to Stored XSS via User Timezone Field
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 below 9.5.4 did not validate the user timezone value (uTimezone) on write and rendered it without output encoding on the Dashboard user management page, where Date::getTimezoneDisplayName() returns any non-IANA value unchanged. A stored cross-site
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一、 漏洞 CVE-2026-85385 基础信息
漏洞信息
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Vulnerability Title
Concrete CMS below 9.5.4 is vulnerable to Stored XSS via User Timezone Field
来源: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS below 9.5.4 did not validate the user timezone value (uTimezone) on write and rendered it without output encoding on the Dashboard user management page, where Date::getTimezoneDisplayName() returns any non-IANA value unchanged. A stored cross-site scripting payload saved in this field executed in an administrator's browser when they viewed the affected user in the Dashboard, running script in the admin session (for example to read CSRF tokens, create administrator accounts, or change site settings). In Concrete CMS 9.5.3 the field became reachable by unauthenticated visitors through public registration; in Concrete CMS below 9.5.3, the same field was reachable by any authenticated user through the account profile editor. Exploitation required concrete.misc.user_timezones to be enabled (off by default), and the unauthenticated path additionally required public registration to be enabled. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.7 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Suraj Bhosale for reporting.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/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-2026-85385 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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CVE-2026-85385 其他参考 (1)
-
Page Not Found :: Concrete CMS release-notes
同批安全公告 · Concrete CMS · 2026-09-16 · 共 6 条
| CVE-2026-85386 | 7.3 HIGH | Concrete CMS before 9.5.4 stored is vulneratble to cross-site scripting via unauthenticate |
| 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-2026-85386
Concrete CMS before 9.5.4 stored is vulneratble to cross-sit
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-2026-85386
Concrete CMS before 9.5.4 stored is vulneratble to cross-sit
Same weakness: CWE-79
V. Comments for CVE-2026-85385
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