Vulnerability in Craftcms Cms
CVE-2026-72782
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Craftcms Cms — versions 5.0.0-RC1, 5.10.6, 4.0.0-RC1
Weakness classification (CWE)
References
- github.com/craftcms/cms/security/advisories/GHSA-596p-6jv8-775v (vendor-advisory)
- www.vulncheck.com/advisories/craft-cms-rc1-before-environment-variable-leak (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72782?
- CVE-2026-72782 is a medium-severity vulnerability in Craftcms Cms, classified under Exposure of Resource to Wrong Sphere. CVSS score: 6.5/10. Published 2026-08-11.
- How severe is CVE-2026-72782?
- Medium severity. CVSS v3 base score is 6.5 out of 10.