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CVE-2026-92591— Craft CMS 5.0.0 before 5.10.13 Environment Secret Exposure via Installer

Quick assessment

Affected
craftcms 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.

Craft CMS 5.0.0 至 5.10.12 版本将数据库连接失败视为“Craft 未安装”，导致在已安装的生产站点上，当 PHP 服务正常但配置的 MySQL 端点不可用时，匿名的安装器操作（包括 install 和 validate-site）变得可访问。该操作接受一个站点名称，通过 进行序列化，并使用 展开 表达式。若未认证攻击者在故障发生前已获取访客会话 Cookie 及匹配的 CSRF 令牌，且该会话在故障期间仍然有效，则攻击者可提交一个可预测的变量名（例如 Craft 约定的 ），从而获取其值，进

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-92591

Vulnerability Information
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Vulnerability Title
Craft CMS 5.0.0 before 5.10.13 Environment Secret Exposure via Installer
Source: CVE Program / CVE List V5
Vulnerability Description
Craft CMS 5.0.0 through 5.10.12 treats a database connection failure as meaning that Craft is not installed, which makes anonymous installer actions — including install/validate-site — reachable on an installed production site whenever PHP remains available but the configured MySQL endpoint does not. The action accepts a site name, serializes it through Site::getName(), and expands ${NAME} expressions using App::env(). An unauthenticated attacker who obtained a guest session cookie and matching CSRF token before the outage and whose session remains valid during it can submit a predictable variable name (for example Craft's conventional CRAFT_SECURITY_KEY) and receive its value, disclosing Craft secrets, process environment variables, $_SERVER entries, or PHP constants such as the security key, database credentials, or API keys. The issue requires an independently occurring database outage; the vulnerability itself provides no way to induce it. Fixed in 5.10.13.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未能安全地进行程序失效(Failing Open)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms 5.0.0 ~ 5.10.13 -

II. Public POCs for CVE-2026-92591

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III. Intelligence Information for CVE-2026-92591

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Vendor Advisories for CVE-2026-92591 (1)

Other References for CVE-2026-92591 (1)

Same Patch Batch · craftcms · 2026-09-16 · 6 CVEs total

CVE-2026-92592 8.8 HIGH Craft CMS before 4.18.6 Remote Code Execution via signed cookie
CVE-2026-92593 8.8 HIGH Craft CMS 5.10.0 before 5.10.13 Authenticated Remote Code Execution
CVE-2026-92594 7.5 HIGH Craft CMS before 5.11.0 Unauthenticated PII Disclosure via GraphQL
CVE-2026-92590 5.4 MEDIUM Craft CMS 5.7.0 before 5.10.13 Stored XSS via Generated Fields
CVE-2026-92589 4.3 MEDIUM Craft CMS 5.0.0 before 5.10.13 Broken Access Control via nested-elements/reorder

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-636

V. Comments for CVE-2026-92591

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