Vulnerability-Lookup

CVE-2026-86427 (GCVE-0-2026-86427)

Vulnerability from cvelistv5 – Published: 2026-09-07 12:53 – Updated: 2026-09-10 15:04

Title

LibreNMS before 26.8.0 Argument Injection via graph_title

Summary

LibreNMS before 26.8.0 contains an argument injection vulnerability in the graph_title parameter that allows authenticated attackers to inject arbitrary rrdtool arguments by breaking out of double-quote escaping. Attackers can inject DEF and LINE arguments to read RRD files from unauthorized devices, or use newline injection to execute arbitrary rrdtool commands, bypassing per-device authorization checks.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 14:24 UTC

CWE

CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/librenms/librenms/security/adv…	vendor-advisory
https://www.vulncheck.com/advisories/librenms-bef…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
librenms	librenms	Affected: 0 , < 26.8.0 (semver) Unaffected: 26.8.0 (semver) cpe:2.3:a:librenms:librenms::::::::

Date Public

2026-08-23 00:00

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-86427

Vulnerability from fkie_nvd - Published: 2026-09-07 13:20 - Updated: 2026-09-10 16:18

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-graph-title

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "defaultStatus": "unaffected",
          "product": "librenms",
          "vendor": "librenms",
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  "id": "CVE-2026-86427",
  "lastModified": "2026-09-10T16:18:02.673",
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}

GHSA-J7JC-M6XG-RRCW

Vulnerability from github – Published: 2026-09-07 15:33 – Updated: 2026-09-07 15:33

Details

Severity

8.8 (High)


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

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
    "CVE-2026-86427"
  ],
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    "github_reviewed": false,
    "github_reviewed_at": null,
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    "severity": "HIGH"
  },
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  "id": "GHSA-j7jc-m6xg-rrcw",
  "modified": "2026-09-07T15:33:53Z",
  "published": "2026-09-07T15:33:53Z",
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    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86427"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-graph-title"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-86427 (GCVE-0-2026-86427)

FKIE_CVE-2026-86427

GHSA-J7JC-M6XG-RRCW

Tags

Sightings

Nomenclature

Related by attack behaviour