Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M
CVE-2026-40084Cacti: Arbitrary File Read via Path Traversal in Report `format_file` Parameter
Medium 6.5
In plain English
A medium-severity path traversal in cacti from Cacti. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | cacti | no fix listed | DEBIAN-CVE-2026-40084 |
| Debian:13 | cacti | no fix listed | DEBIAN-CVE-2026-40084 |
| Debian:14 | cacti | 1.2.31+ds1-1 | DEBIAN-CVE-2026-40084 |
| Ubuntu:24.04:LTS | cacti | no fix listed | UBUNTU-CVE-2026-40084 |
| Ubuntu:25.10 | cacti | no fix listed | UBUNTU-CVE-2026-40084 |
| Ubuntu:26.04:LTS | cacti | no fix listed | UBUNTU-CVE-2026-40084 |
| Ubuntu:26.10 | cacti | no fix listed | UBUNTU-CVE-2026-40084 |
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/Cacti/cacti/security/advisories/GHSA-mjvw-mhj5-9jcj x_refsource_CONFIRM
- https://github.com/Cacti/cacti/commit/4c09efaebf3a9faec66969d0b5c4aceaf397f37f x_refsource_MISC