CVE-2026-0650: OpenFlagr contains an authentication bypass vulnerability in the HTTP middleware
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.
Published Jan 7, 2026
Affected packages
github.com/openflagr/flagr
- Ecosystem
- Go
- Affected
- < 0.0.0-20251009103504-fe83dc87aa40
- Fixed in
- 0.0.0-20251009103504-fe83dc87aa40
- Check
go list -m github.com/openflagr/flagr
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
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.
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-0650
- 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
- https://github.com/openflagr/flagr/commit/fe83dc87aa404a57554aa5839ac450f55c203570
- https://github.com/advisories/GHSA-rwp9-5g7q-73q3
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology