# CVE-2026-15990: Formidable Charts <= 2.0.1 - Unauthenticated Arbitrary File Read via 'frm_graph' Parameter

> Unauthenticated attackers can read arbitrary server files via directory traversal in the Formidable Charts WordPress plugin.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Aug 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-83fw-wqq3-pqp2

## What is CVE-2026-15990?

CVE-2026-15990 is a high-severity path traversal vulnerability in Strategy11 Formidable Charts, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Formidable Charts plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.0.1 via the 'frm_graph' parameter. This makes it possible for unauthenticated attackers to read the contents of arbitrary files on the server, which can contain sensitive information. Successful exploitation requires Formidable Forms Lite, Formidable Forms Pro, and Formidable Charts to be active and requires the wp-content/uploads/frm-charts/ directory to exist, normally after an image-format chart is rendered.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-15990?


## How do I fix CVE-2026-15990?

No fix has been published for CVE-2026-15990 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15990 being exploited?

There is no known exploitation of CVE-2026-15990 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15990 and fix it if it is affected.

What it is: CVE-2026-15990 is a high-severity path traversal vulnerability in Strategy11 Formidable Charts, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-15990 in the wild and no public exploit code.

Affected product: Strategy11 Formidable Charts. 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-2026-15990/ (Markdown: https://insights.sbomify.com/CVE-2026-15990/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15990
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15990
- OSV: https://osv.dev/vulnerability/CVE-2026-15990

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15990/
Summaries are generated and may contain mistakes; the official description above is the record.