# CVE-2026-40084: Cacti: Arbitrary File Read via Path Traversal in Report `format_file` Parameter

> Attackers can read arbitrary files from the server via path traversal in the report format_file parameter, exposing sensitive data.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A: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:** 25 Jun 2026
- **Updated:** 26 Jun 2026
- **Also known as:** DEBIAN-CVE-2026-40084, GHSA-mjvw-mhj5-9jcj, UBUNTU-CVE-2026-40084

## What is CVE-2026-40084?

CVE-2026-40084 is a medium-severity path traversal vulnerability in Cacti Cacti, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Path Traversal  through the Report format_file Parameter, causing arbitrary file read. This vulnerability occurs in two stages. In the first stage (stored injection), lib/html_reports.php at line 283 stores $save['format_file'] =  $post['format_file'] directly into the database without any validation. In the second stage (file read), lib/reports.php at line 667 concatenates  CACTI_PATH_FORMATS . '/' . $format_file, and line 670 then calls file($format_file), reading arbitrary files from the filesystem. This issue has been fixed in version 1.2.31.

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

## Which versions are affected by CVE-2026-40084?

It affects 1 product.


Products: Cacti Cacti.

## How do I fix CVE-2026-40084?

Upgrade to a fixed version.

## Is CVE-2026-40084 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40084 exists.

## Other vulnerabilities in Cacti Cacti

- [CVE-2022-46169](https://insights.sbomify.com/CVE-2022-46169/): Cacti Command Injection (critical 9.8, exploited in the wild)
- [CVE-2026-39893](https://insights.sbomify.com/CVE-2026-39893/): Cacti: Pre-authentication SQL injection via rfilter RLIKE clause in graph_view.php (critical 9.8)
- [CVE-2026-39938](https://insights.sbomify.com/CVE-2026-39938/): Cacti: Unauthenticated RCE on Graph Image (critical 9.8)
- [CVE-2026-39955](https://insights.sbomify.com/CVE-2026-39955/): Cacti has Pre-Authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php (critical 9.8)
- [CVE-2023-39361](https://insights.sbomify.com/CVE-2023-39361/): Unauthenticated SQL Injection in graph_view.php in Cacti (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40084 and fix it if it is affected.

What it is: CVE-2026-40084 is a medium-severity path traversal vulnerability in Cacti Cacti, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40084 exists.

Affected product: Cacti Cacti. 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-2026-40084/ (Markdown: https://insights.sbomify.com/CVE-2026-40084/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40084
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40084
- OSV: https://osv.dev/vulnerability/CVE-2026-40084

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40084/
Summaries are generated and may contain mistakes; the official description above is the record.