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CVE-2026-23934— Frontend DoS via the validate.api.exists action

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 7.4.0版本至7.4.11版本存在资源管理错误漏洞，该漏洞源于Frontend validate.api.exists操作处理特制请求时存在资源管理错误，可能导致经过身份验证的攻击者造成前端Web服务器CPU负载过大，从而引发拒绝服务。

CVSS 5.1 · Medium EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zabbix Zabbix 7.4.0≤ 7.4.11 affected
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I. Basic Information for CVE-2026-23934

Vulnerability Information
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Vulnerability Title
Frontend DoS via the validate.api.exists action
Source: CVE Program / CVE List V5
Vulnerability Description
An authenticated user is able to cause disproportionate CPU load on the Frontend webserver by sending specifically crafted requests to the Frontend validate.api.exists action, leading to potential denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Zabbix 资源管理错误漏洞
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 7.4.0版本至7.4.11版本存在资源管理错误漏洞，该漏洞源于Frontend validate.api.exists操作处理特制请求时存在资源管理错误，可能导致经过身份验证的攻击者造成前端Web服务器CPU负载过大，从而引发拒绝服务。
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 ~ 7.4.11 -

II. Public POCs for CVE-2026-23934

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III. Intelligence Information for CVE-2026-23934

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Vendor Advisories for CVE-2026-23934 (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-2026-59781 5.4 MEDIUM Improper validation of custom installation directories on Windows could allow installation
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-2026-23938 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-405

V. Comments for CVE-2026-23934

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