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CVE-2026-0650 — Vulnerability in github.com/openflagr/flagr — CVE...

CRITICAL

OpenFlagr contains an authentication bypass vulnerability in the HTTP middleware

Published January 7, 2026Updated February 3, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published January 7, 2026 (278 days ago).
  • Last revised February 3, 2026 — 27 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update github.com/openflagr/flagr to 0.0.0-20251009103504-fe83dc87aa40 or later
go get github.com/openflagr/flagr@v0.0.0-20251009103504-fe83dc87aa40

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
github.com/openflagr/flagr
go
All versions0.0.0-20251009103504-fe83dc87aa40

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2026-0650?
OpenFlagr contains an authentication bypass vulnerability in the HTTP middleware This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-0650?
CVE-2026-0650 affects github.com/openflagr/flagr. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-0650 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-rwp9-5g7q-73q3
GO-2026-4286

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