CVE-2026-40084

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 60% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Path Traversal through the Report format_file Parameter, causing arbitrary file read. This vulnerability occurs in two stages. In the first stage (stored injection), lib/html_reports.php at line 283 stores $save['format_file'] = $post['format_file'] directly into the database without any validation. In the second stage (file read), lib/reports.php at line 667 concatenates CACTI_PATH_FORMATS . '/' . $format_file, and line 670 then calls file($format_file), reading arbitrary files from the filesystem. This issue has been fixed in version 1.2.31.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 29, 2026

Advisory Details (2)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Arbitrary File Read via Path Traversal in Report `format_file` Parameter · Advisory · Cacti/cacti · GitHub

https://github.com/Cacti/cacti/security/advisories/GHSA-mjvw-mhj5-9jcj
github_commit Patch Available

commit 4c09efaebf3a (Cacti/cacti)

Patch available: Cacti/cacti release/1.2.31 (contains commit 4c09efaebf3a)

https://github.com/Cacti/cacti/commit/4c09efaebf3a9faec66969d0b5c4aceaf397f37f

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
cacti1.2.16+ds1-2 ... 1.2.31+ds1-2 (31 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
cacti1.2.24+ds1-1 ... 1.2.31+ds1-2 (20 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
cacti1.2.30+ds1-1, 1.2.30+ds1-2, 1.2.30+ds1-3, 1.2.31+ds1-1, 1.2.31+ds1-2——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
cacti1.2.30+ds1-1, 1.2.30+ds1-2, 1.2.30+ds1-31.2.31+ds1-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 110 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 09:37 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
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  11. 2026-08-30 19:27 UTCEG score recompute
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  1. 2026-08-20 07:00 UTCEG score recompute
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  20. 2026-08-09 13:46 UTCEPSS rescore
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  27. 2026-08-05 19:17 UTCEPSS rescore
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  40. 2026-07-30 01:30 UTCEPSS rescore
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  45. 2026-07-26 14:54 UTCEPSS rescore
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  48. 2026-07-25 14:18 UTCEPSS rescore
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  74. 2026-07-06 02:23 UTCEPSS rescore
  75. 2026-07-06 02:23 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40084?
CVE-2026-40084 is a medium vulnerability published on June 25, 2026. Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Path Traversal through the Report formatfile Parameter, causing arbitrary file read. This vulnerability occurs in two stages. In the first stage (stored injection), lib/htmlreports.php at…
When was CVE-2026-40084 disclosed?
CVE-2026-40084 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40084 actively exploited?
CVE-2026-40084 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.7% of all scored CVEs.
What is the CVSS score of CVE-2026-40084?
CVE-2026-40084 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-40084?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40084, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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