CVE-2026-0650 OpenFlagr <= 1.1.18 Authentication Bypass via Prefix Whitelist Path Normalization
Attackers can bypass authentication via path normalization flaws to access protected APIs, modify feature flags, and export sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-0650?
CVE-2026-0650 is a critical authentication bypass vulnerability in OpenFlagr Flagr, published on 7 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-0650?
3 open source packages ship an affected version, including github.com/openflagr/flagr.
| Package | Affected | Fixed in |
|---|---|---|
github.com/openflagr/flagr Go | All versions | 0.0.0-20251009103504-fe83dc87aa40 |
github.com/openflagr/flagr Go | All versions | 0.0.0-20251009103504-fe83dc87aa40 |
github.com/openflagr/flagr Go | All versions | 0.0.0-20251009103504-fe83dc87aa40 |
How do I fix CVE-2026-0650?
Upgrade github.com/openflagr/flagr to 0.0.0-20251009103504-fe83dc87aa40 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-0650 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-0650 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-rwp9-5g7q-73q3, GO-2026-4286.