Vulnerability · Published Aug 11, 2026 · Assigned by VulnCheck

CVE-2026-72782Craft CMS 5.0.0-RC1 before 5.10.6 Environment Variable Leak

Medium 6.5

In plain English

A medium-severity security flaw in cms from craftcms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 67.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Craft CMS versions >= 5.0.0-RC1 before 5.10.6 and >= 4.0.0-RC1 before 4.18.2 interpolate environment variables and secrets (via ${ENV_VAR} strings in the elementId parameter) into Twig templates before rendering, even when the Twig sandbox is enabled. An authenticated attacker with control panel access can render a malicious sandboxed Twig template and, using a blind error-based technique across many requests, incrementally leak arbitrary environment variables and secrets. These can be abused to forge sessions (via CRAFT_SECURITY_KEY), escalate privileges, and steal database, SMTP, API, or blob storage credentials. Fixed in 5.10.6 and 4.18.2.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	craftcms/cms	5.10.6	GHSA-596p-6jv8-775v
Packagist	craftcms/cms	4.18.2	GHSA-596p-6jv8-775v

Affected products (as reported)

Vendor	Product	Versions
craftcms	cms	5.0.0-RC1 – before 5.10.6
craftcms	cms	4.0.0-RC1 – before 4.18.2

Weakness: CWE-668 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

GitHub Security Advisory (GHSA-596p-6jv8-775v) vendor-advisory
VulnCheck Advisory: Craft CMS 5.0.0-RC1 before 5.10.6 Environment Variable Leak third-party-advisory