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CVE-2026-1199— API and Frontend login lockout race condition

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 6.0.0版本至6.0.46版本、7.0.0版本至7.0.27版本和7.4.0版本至7.4.11版本存在竞争条件问题漏洞，该漏洞源于API和Frontend登录锁定机制存在竞争条件问题，多个不成功登录请求同时发送时未正确计入阻止计数器，可能导致比预期更多的密码猜测。

CVSS 6.9 · Medium EPSS 0.24% · P15

Affected Version Matrix 3

VendorProduct Version RangeStatus
Zabbix Zabbix 6.0.0≤ 6.0.46 affected
7.0.0≤ 7.0.27 affected
7.4.0≤ 7.4.11 affected
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I. Basic Information for CVE-2026-1199

Vulnerability Information
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Vulnerability Title
API and Frontend login lockout race condition
Source: CVE Program / CVE List V5
Vulnerability Description
Zabbix API and Frontend login lockout mechanism has a flaw where several unsuccessful login requests are not properly counted towards the block counter if sent simultaneously, potentially allowing for more password guesses than intended.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Zabbix 竞争条件问题漏洞
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 6.0.0版本至6.0.46版本、7.0.0版本至7.0.27版本和7.4.0版本至7.4.11版本存在竞争条件问题漏洞，该漏洞源于API和Frontend登录锁定机制存在竞争条件问题，多个不成功登录请求同时发送时未正确计入阻止计数器，可能导致比预期更多的密码猜测。
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 6.0.0 ~ 6.0.46 -

II. Public POCs for CVE-2026-1199

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III. Intelligence Information for CVE-2026-1199

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Vendor Advisories for CVE-2026-1199 (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-2026-23935 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-2026-23934 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-362

V. Comments for CVE-2026-1199

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