Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2026-39949

Cacti Authenticated Remote Code Execution

Cacti

Watch CVE-2026-39949 Browse KEV feed
Severity
CVSS 7.2 · High
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
—
First observed
14 Oct 2026
Last observed
14 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-39949 is a vulnerability affecting Cacti. An authenticated OS command injection vulnerability in Cacti 1.2.30 and earlier allows an attacker with device and graph template management privileges to execute...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence.

Who is affected?

Cacti.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Cacti Authenticated Remote Code Execution

An authenticated OS command injection vulnerability in Cacti 1.2.30 and earlier allows an attacker with device and graph template management privileges to execute arbitrary operating system commands.

The vulnerability exists in Cacti's variable substitution engine, which incorporates user-controlled host metadata into RRDtool command-line arguments without sufficient sanitization. An attacker can inject shell metacharacters into a device's notes field, reference the |host_notes| variable in a crafted graph template, and trigger command execution when the graph is rendered.

Successful exploitation can result in remote code execution with the privileges of the web server process.

Published
—
Exploitation Reported
14 Oct 2026
Attack vector
Remote
Complexity
Low
Privileges
High
User interaction
None

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-39949

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Previdian

Recorded 14 Oct 2026

Previdian independently recorded this as exploited after first seeing it in honeypot sensors.

Active exploitation observed

Previdian sensor

First observed 14 Oct 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
Previdian Sensors First 2026-10-14 08:31 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

1

Attempts observed

1

Unique attacker IPs

1

Attacker countries

CN

1

Sensors observed

CVE-2026-39949 exploitation attempts over the last 7 days

Daily events observed by Previdian sensors

Updated 17 Oct 2026

0
0
0
1
0
0
0
11 Oct 12 Oct 13 Oct 14 Oct 15 Oct 16 Oct 17 Oct

First observed 14 Oct 2026 · Last observed 14 Oct 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
1
1
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

Learn about Pro API access

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.2 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS

—

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Timeline

From disclosure to observed exploitation

  1. 05:22 UTC

    Indicator of compromise added

    Indicators of compromise recorded

  2. 05:22 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-39949

Sample API response 
{
  "cve_id": "CVE-2026-39949",
  "confidence": "Confirmed",
  "cvss_score": 7.2,
  "cvss_estimated": false,
  "epss_score": null,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 1, "sensors": 1 }
}