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

> Authenticated attackers can leak environment variables and secrets via Twig template interpolation, enabling session forgery and credential theft.

- **Severity:** High 7.1 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 11 Aug 2026
- **Updated:** 8 Oct 2026
- **Also known as:** GHSA-596p-6jv8-775v

## What is CVE-2026-72782?

CVE-2026-72782 is a high-severity vulnerability in craftcms cms, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### 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.

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere)

## Which versions are affected by CVE-2026-72782?

4 open source packages ship an affected version, including craftcms/cms.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `craftcms/cms` | Packagist | From 4.0.0-RC1 | 4.18.2 |
| `craftcms/cms` | Packagist | From 4.0.0-RC1 | 4.18.2 |
| `craftcms/cms` | Packagist | From 5.0.0-RC1 | 5.10.6 |
| `craftcms/cms` | Packagist | From 5.0.0-RC1 | 5.10.6 |

## How do I fix CVE-2026-72782?

Upgrade craftcms/cms to a fixed version for your release line: 4.18.2 or 5.10.6.

## Is CVE-2026-72782 being exploited?

There is no known exploitation of CVE-2026-72782 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-72782 and fix it if it is affected.

What it is: CVE-2026-72782 is a high-severity vulnerability in craftcms cms, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-72782 in the wild and no public exploit code.

Affected packages and fixed versions:
- craftcms/cms (Packagist): affected from 4.0.0-RC1; fixed in 4.18.2
- craftcms/cms (Packagist): affected from 4.0.0-RC1; fixed in 4.18.2
- craftcms/cms (Packagist): affected from 5.0.0-RC1; fixed in 5.10.6
- craftcms/cms (Packagist): affected from 5.0.0-RC1; fixed in 5.10.6

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-72782/ (Markdown: https://insights.sbomify.com/CVE-2026-72782/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-72782
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72782
- OSV: https://osv.dev/vulnerability/CVE-2026-72782

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-72782/
Summaries are generated and may contain mistakes; the official description above is the record.