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Vulnerability record · CVE-2026-0650 · published 7 January 2026

CVE-2026-0650: Missing authentication for critical function vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 1.5% · top 26.1% CWE-306 · Missing authentication for critical functionCWE-425 · CWE-425 Deferred
9.3CVSS 4.0 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
14 Jul 2026Last modified by NVD

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.

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/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:

References

LinkTags
https://dreyand.rs/code%20review/golang/2026/01/03/0day-speedrun-openflagr-less-1118-authentication-bypass
https://github.com/openflagr/flagr/releases/tag/1.1.19
https://www.vulncheck.com/advisories/openflagr-authentication-bypass-via-prefix-whitelist-path-normalization

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Source: NIST National Vulnerability Database (record CVE-2026-0650), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.