Vulnerability · CVE-2026-39949
Cacti Authenticated Remote Code Execution via Host Variable Injection
Published Oct 14, 2026 · corrected/updated Oct 14, 2026 · The Cacti Group Cacti · evidence confidence very high
Cacti ≤ 1.2.30 has an authenticated OS command injection flaw. Users with device and graph template creation privileges can put shell metacharacters in a device’s notes field. Cacti’s variable replacement engine inserts that field, unsanitized, into RRDtool command-line arguments through the |host_notes| variable. When a graph built from a template using that variable is rendered, the injected commands run on the server as the web server user, giving full remote code execution.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-39949 is a unknown public vulnerability record for The Cacti Group Cacti. CISA lists it as known exploited. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether The Cacti Group Cacti is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: The Cacti Group Cacti. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: no CVSS/EPSS yet. CISA lists it as known exploited. Sources contributing to this record: cve_org, vulncheck_kev. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Confirmed in CISA KEV since Oct 14, 2026. Listed in CISA KEV and VulnCheck KEV.
Patch and remediation
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 14, 2026 · VulnCheck KEV
Detected
Cacti ≤ 1.2.30 has an authenticated OS command injection flaw. Users with device and graph template creation privileges can put shell metacharacters in a device’s notes field. Cacti’s variable replacement engine inserts that field, unsanitized, into RRDtool command-line arguments through the |host_notes| variable. When a graph built from a template using that variable is rendered, the injected com
Oct 14, 2026 · CISA KEV
Known exploited
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected
- vendor The Cacti Group Cactiversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-39949
Official CVE identifier
cve.org - VulnCheck KEVConfirmed exploitationCVE-2026-39949
Cacti ≤ 1.2.30 has an authenticated OS command injection flaw. Users with device and graph template creation privileges can put shell metacharacters in a device’s notes field. Cacti’s variable replacement engine inserts that field, unsanitized, into RRDtool command-line arguments
vulncheck.com