# CVE-2026-123491: Craft CMS 4.0.0 before 4.18.9 Unauthenticated SQL Injection via GraphQL Eager-Load Select


- **Severity:** High 8.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 6 Nov 2026
- **Updated:** 6 Nov 2026
- **Also known as:** GHSA-6534-m2vq-3r2h, GHSA-mjj9-pjh4-r48g

## What is CVE-2026-123491?

CVE-2026-123491 is a high-severity vulnerability in craftcms cms, published on 6 Nov 2026. 

### Official description

Craft CMS 4.0.0 before 4.18.9 and 5.0.0 before 5.11.2 contains an SQL injection vulnerability in GraphQL eager-loading: arguments on eager-loadable nodes absent from the public schema are copied into EagerLoadPlan criteria without cleansing. Unauthenticated attackers can supply a parenthesized select argument to inject SQL expressions and read arbitrary database content, including password hashes and session tokens.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2026-123491?


## How do I fix CVE-2026-123491?

No fix has been published for CVE-2026-123491 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-123491 being exploited?

There is no known exploitation of CVE-2026-123491 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-123491 and fix it if it is affected.

What it is: CVE-2026-123491 is a high-severity vulnerability in craftcms cms, published on 6 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-123491 in the wild and no public exploit code.

Affected product: craftcms cms. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-123491/ (Markdown: https://insights.sbomify.com/CVE-2026-123491/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-123491
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123491
- OSV: https://osv.dev/vulnerability/CVE-2026-123491

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-123491/
Summaries are generated and may contain mistakes; the official description above is the record.