RCE in Cacti
CVE-2026-39938
Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have unauthenticated LFI through graph_theme and rrdtool IPC serialization hardening. This issue has been resolved in version 1.2.31.
Vulnerability class: Path Traversal (Directory Traversal)
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: 0.007 (51.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Cacti — versions < 1.2.31
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/Cacti/cacti/security/advisories/GHSA-rm7p-qcqm-x5m6 (Patch, Vendor Advisory)
- github.com/Cacti/cacti/commit/9871f0cef9af285398d558c9b3188d5977e01a04 (Patch)
Frequently asked questions
- What is CVE-2026-39938?
- CVE-2026-39938 is a critical-severity vulnerability in Cacti, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-06-24.
- How severe is CVE-2026-39938?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-39938 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.