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CVE-2026-59781— Improper validation of custom installation directories on Windows could allow installation into locations with unsafe permissions, increasing the risk of DLL sideloading.

Quick assessment

Affected
Zabbix Zabbix
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zabbix是拉脱维亚Zabbix公司开源的一套开源的监控系统。该系统支持网络监控、服务器监控、云监控和应用监控等。 Zabbix 7.4.12及之前版本、7.0.28及之前版本和6.0.47及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于在Windows上安装到自定义目录时安装程序未验证所选目录的安全访问权限，可能导致攻击者放置恶意DLL并造成DLL sideloading。

CVSS 5.4 · Medium EPSS 0.11% · P2

Possible ATT&CK Techniques 2 AI

T1055 · Process Injection T1574.001 · DLL

Affected Version Matrix 3

VendorProduct Version RangeStatus
Zabbix Zabbix 7.4.0≤ 7.4.12 affected
7.0.0≤ 7.0.28 affected
6.0.0≤ 6.0.47 affected
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I. Basic Information for CVE-2026-59781

Vulnerability Information
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Vulnerability Title
Improper validation of custom installation directories on Windows could allow installation into locations with unsafe permissions, increasing the risk of DLL sideloading.
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对搜索路径元素未加控制
Source: CVE Program / CVE List V5
Vulnerability Title
Zabbix 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zabbix是拉脱维亚Zabbix公司开源的一套开源的监控系统。该系统支持网络监控、服务器监控、云监控和应用监控等。 Zabbix 7.4.12及之前版本、7.0.28及之前版本和6.0.47及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于在Windows上安装到自定义目录时安装程序未验证所选目录的安全访问权限，可能导致攻击者放置恶意DLL并造成DLL sideloading。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zabbix Zabbix 7.4.0 ~ 7.4.12 -

II. Public POCs for CVE-2026-59781

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III. Intelligence Information for CVE-2026-59781

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Vendor Advisories for CVE-2026-59781 (1)

Same Patch Batch · Zabbix · 2026-08-18 · 11 CVEs total

CVE-2026-23929 8.5 HIGH Prototype pollution leading to stored XSS
CVE-2026-23933 7.7 HIGH Hardcoded session key in Zabbix 7.4
CVE-2026-1199 6.9 MEDIUM API and Frontend login lockout race condition
CVE-2026-23935 6.8 MEDIUM Use-after-free read in script item/preprocessing HttpRequest body
CVE-2026-23937 6.0 MEDIUM Host PSK extraction in Zabbix API
CVE-2026-23931 5.3 MEDIUM Frontend plaintext macro value enumeration via the validatate.api.exists action
CVE-2026-23930 5.3 MEDIUM Frontend DoS via the popup.testtriggerexpr action
CVE-2026-23934 5.1 MEDIUM Frontend DoS via the validate.api.exists action
CVE-2026-23938 2.1 LOW Server DoS via JavaScript preprocessing or script items
CVE-2026-23922 2.1 LOW Email media OAuth secret leak to Super Admin

IV. Related Vulnerabilities

Same product: Zabbix
Same vendor: Zabbix
Same weakness: CWE-427

V. Comments for CVE-2026-59781

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