RCE in Cacti
CVE-2026-40079
Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Command Injection due to lack of sanitization in the escape_command() function. The escape_command() function at lib/rrd.php is a no-op: it returns $command unchanged. The command line built by rrdtool_function_graph() is passed through this function and then to shell_exec($full_commandline). The risk is in __rrd_execute() where text_format values from graph templates (which may contain host variable substitutions) reach shell_exec without adequate escaping. This issue has been addressed in version 1.2.31.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Cacti — versions < 1.2.31
Weakness classification (CWE)
References
- github.com/Cacti/cacti/security/advisories/GHSA-xq98-376r-hv9j (Patch, Mitigation, Vendor Advisory)
- github.com/Cacti/cacti/commit/4c09efaebf3a9faec66969d0b5c4aceaf397f37f (Patch)
Frequently asked questions
- What is CVE-2026-40079?
- CVE-2026-40079 is a critical-severity vulnerability in Cacti, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-06-25.
- How severe is CVE-2026-40079?
- Critical severity. CVSS v3 base score is 9.8 out of 10.