CVE-2026-39938Public exploitNetwork attack vector

Unauthenticated code execution via graph_theme traversal

Published Jun 24, 2026 · Updated Jun 24, 2026

Path traversal in Cacti 1.2.30 and earlier allows remote attackers to read local files through unauthenticated graph image requests. The rrdtool_function_theme_font_options() function appends graph_theme beneath include/themes and loads the resulting rrdtheme.php path without rejecting traversal sequences. No account or user interaction is required; readable files can be exposed, and inclusion of a poisoned web-server log can execute code in the Cacti process.

CVSS severity9.8
Critical
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Cacti 1.2.30 and earlier allows remote attackers to read local files through unauthenticated graph image requests. The rrdtool_function_theme_font_options() function appends graph_theme beneath include/themes and loads the resulting rrdtheme.php path without rejecting traversal sequences. No account or user interaction is required; readable files can be exposed, and inclusion of a poisoned web-server log can execute code in the Cacti process.

The record

CVE
CVE-2026-39938
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Cacti Group
Product
Cacti
Classifications
CWE-22, CWE-78, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.2.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Cacti Group · Cactiversion=< 1.2.31

Published CVSS scores

9.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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