EUVD-2026-81291
GHSA-fq6c-26cc-63cr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network and unauthenticated (AV:N/PR:N), but AC:H because it needs an attacker-uninducible DB outage plus a pre-obtained valid session; confidentiality-only (C:H, I:N/A:N).
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
Information disclosure in Craft CMS 5.0.0 through 5.10.12 can expose environment variables, secrets, database credentials, and other sensitive values when an independently occurring MySQL outage causes the application to treat the site as not installed. An unauthenticated attacker per the CVSS PR:N vector can reach anonymous installer actions such as install/validate-site if they previously obtained a valid guest session cookie and matching CSRF token and that session remains valid during the outage, then submit a predictable variable name and receive its expanded value. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires ALL of: (1) the target runs an affected Craft CMS 5.0.0-5.10.12 installation; (2) an independently-occurring database (MySQL) outage while PHP remains available - the vulnerability provides no way to induce this; (3) the attacker obtained a valid guest session cookie and matching CSRF token BEFORE the outage, and that session remains valid during it; (4) the attacker knows or guesses a predictable environment variable/constant name (e.g. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but conditionally-gated confidentiality flaw, not a widespread-exploitation priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: 5.10.13; upgrade to Craft CMS 5.10.13 or later, per the vendor advisory GHSA-hfjh-gw6x-7pv5 (https://github.com/craftcms/cms/security/advisories/GHSA-hfjh-gw6x-7pv5) and the VulnCheck advisory (https://www.vulncheck.com/advisories/craft-cms-5.0.0-before-5.10.13-environment-secret-exposure-via-installer). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every Craft CMS deployment and identify those running 5.0.0 through 5.10.12, prioritizing internet-facing installs; upgrade all confirmed-vulnerable internet-facing instances to Craft CMS 5.10.13, which the advisory identifies as the vendor fix (vendor-released patch: 5.10.13), and schedule the upgrade as a priority change given no vendor patch is registered in the source data even though a fixed version is documented. …
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External POC / Exploit Code
Leaving vuln.today