CVE-2026-92591 Craft CMS 5.0.0 before 5.10.13 Environment Secret Exposure via Installer
An unauthenticated attacker can expose sensitive environment variables and secrets if a database outage occurs, allowing access to credentials and keys.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-92591?
CVE-2026-92591 is a high-severity vulnerability in craftcms cms, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-636
Which versions are affected by CVE-2026-92591?
How do I fix CVE-2026-92591?
No fix has been published for CVE-2026-92591 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-92591 being exploited?
There is no known exploitation of CVE-2026-92591 in the wild and no public exploit code.
Sources
Also known as GHSA-fq6c-26cc-63cr, GHSA-hfjh-gw6x-7pv5.