Vulnerability in Craftcms Cms
CVE-2026-92591
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/craftcms/cms/security/advisories/GHSA-hfjh-gw6x-7pv5 (vendor-advisory)
- www.vulncheck.com/advisories/craft-cms-5.0.0-before-5.10.13-environment-secret-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92591?
- CVE-2026-92591 is a medium-severity vulnerability in Craftcms Cms, classified under CWE-636. CVSS score: 5.9/10. Published 2026-09-16.
- How severe is CVE-2026-92591?
- Medium severity. CVSS v3 base score is 5.9 out of 10.