CVE-2026-0650— OpenFlagr <= 1.1.18 Authentication Bypass via Prefix Whitelist Path Normalization
Quick assessment
Affected
OpenFlagr Flagr
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
flagr是openflagr开源的一个监控服务。 flagr 1.1.18及之前版本存在安全漏洞，该漏洞源于HTTP中间件中白名单逻辑的路径规范化处理不当，可能导致身份验证绕过。
Public Exploits 1
Nuclei · 1
CVE-2026-0650.yaml [template]
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-0650
Vulnerability Information
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Vulnerability Title
OpenFlagr <= 1.1.18 Authentication Bypass via Prefix Whitelist Path Normalization
Source: CVE Program / CVE List V5
Vulnerability Description
OpenFlagr versions prior to and including 1.1.18 contain an authentication bypass vulnerability in the HTTP middleware. Due to improper handling of path normalization in the whitelist logic, crafted requests can bypass authentication and access protected API endpoints without valid credentials. Unauthorized access may allow modification of feature flags and export of sensitive data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
flagr 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
flagr是openflagr开源的一个监控服务。 flagr 1.1.18及之前版本存在安全漏洞，该漏洞源于HTTP中间件中白名单逻辑的路径规范化处理不当，可能导致身份验证绕过。
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
II. Public POCs for CVE-2026-0650
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | OpenFlagr <= 1.1.18 contains an authentication bypass caused by improper path normalization handling in HTTP middleware whitelist logic, letting attackers access protected API endpoints without valid credentials, exploit requires crafted requests. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-0650.yaml | POC Details |
AI-Generated POC
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Other References for CVE-2026-0650 (3)
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https://dreyand.rs/code%20review/golang/2026/01/03/0day-speedrun-openflagr-less-1118-authentication-bypass technical-description exploit
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V. Comments for CVE-2026-0650
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