Vulnerability-Lookup

GHSA-734C-5898-QRPH

Vulnerability from github – Published: 2026-08-18 15:31 – Updated: 2026-08-18 15:31

Details

When Zabbix Agent was installed on Windows into a custom installation directory, the installer did not verify whether the selected directory had secure access permissions. If the target directory allowed unauthorized users to modify its contents, an attacker could place a malicious DLL that could later be loaded by the application, resulting in DLL sideloading. The installer has been hardened to detect potentially unsafe installation directories and now requires explicit user confirmation before proceeding with installation in such locations. This reduces the risk of accidental installation into directories with inappropriate permissions while preserving compatibility with existing deployment scenarios.

Severity

5.4 (Medium)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-59781"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-427"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-18T13:17:25Z",
    "severity": "MODERATE"
  },
  "details": "When Zabbix Agent was installed on Windows into a custom installation directory, the installer did not verify whether the selected directory had secure access permissions. If the target directory allowed unauthorized users to modify its contents, an attacker could place a malicious DLL that could later be loaded by the application, resulting in DLL sideloading. The installer has been hardened to detect potentially unsafe installation directories and now requires explicit user confirmation before proceeding with installation in such locations. This reduces the risk of accidental installation into directories with inappropriate permissions while preserving compatibility with existing deployment scenarios.",
  "id": "GHSA-734c-5898-qrph",
  "modified": "2026-08-18T15:31:37Z",
  "published": "2026-08-18T15:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59781"
    },
    {
      "type": "WEB",
      "url": "https://support.zabbix.com/browse/ZBX-28077"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/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"
    }
  ]
}

CVE-2026-59781 (GCVE-0-2026-59781)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:21 – Updated: 2026-08-18 13:34

Title

Improper validation of custom installation directories on Windows could allow installation into locations with unsafe permissions, increasing the risk of DLL sideloading.

Summary

Severity

5.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 12:51 UTC

CWE

CWE-427 - Uncontrolled Search Path Element

Assigner

Zabbix mitre root

References

1 reference

URL	Tags
https://support.zabbix.com/browse/ZBX-28077

Impacted products

1 product

Vendor	Product	Version
Zabbix	Zabbix	Affected: 7.4.0 , ≤ 7.4.12 (git) Affected: 7.0.0 , ≤ 7.0.28 (git) Affected: 6.0.0 , ≤ 6.0.47 (git)

Credits

Zabbix wants to thank Kazuma Matsumoto of GMO Cybersecurity by IERAE, Inc. for finding and reporting this issue.

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JSON

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                "role": "CISA Coordinator",
                "timestamp": "2026-08-18T12:51:53.740332Z",
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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.

Action not permitted

GHSA-734C-5898-QRPH

CVE-2026-59781 (GCVE-0-2026-59781)

Tags

Sightings

Nomenclature