Path Traversal in Cacti
CVE-2026-40084
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Cacti — versions < 1.2.31
Weakness classification (CWE)
References
- github.com/Cacti/cacti/commit/4c09efaebf3a9faec66969d0b5c4aceaf397f37f (Patch)
- github.com/Cacti/cacti/security/advisories/GHSA-mjvw-mhj5-9jcj (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-40084?
- CVE-2026-40084 is a medium-severity vulnerability in Cacti, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-06-25.
- How severe is CVE-2026-40084?
- Medium severity. CVSS v3 base score is 6.5 out of 10.