GitHub Security Advisory (GHSA-596p-6jv8-775v)Vendor advisory
https://github.com/craftcms/cms/security/advisories/GHSA-596p-6jv8-775v CVE-2026-72782
HIGH
Craft CMS 5.0.0-RC1 before 5.10.6 Environment Variable Leak
Record summary
CVE-2026-72782 has a selected CVSS score of 7.1 (high).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 11, 2026 · Source: CVE List
Affected products and versions
1| Product | Source | Version range | Status |
|---|---|---|---|
Default status: unaffected | CVE List | 5.0.0-RC1 to < 5.10.6 | affected |
| 5.10.6 | unaffected | ||
| 4.0.0-RC1 to < 4.18.2 | affected | ||
| 4.18.2 | unaffected |
References
3nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-72782 VulnCheck Advisory: Craft CMS 5.0.0-RC1 before 5.10.6 Environment Variable LeakThird-party advisory
https://www.vulncheck.com/advisories/craft-cms-rc1-before-environment-variable-leak