Vulnerabilities in pkg:golang/github.com/openflagr/flagr

PACKAGE
Advisory Identifier: GHSA-rwp9-5g7q-73q3
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Advisory Summary

CVE-2026-0650 is a CRITICAL authentication bypass vulnerability (CWE-425: Direct Request ('Forced Browsing')) affecting Github.com/openflagr/flagr libraries in the Go ecosystem. The issue involves openflagr contains an authentication bypass vulnerability in the http middleware. Remediation is available by upgrading affected packages to version 0.0.0-20251009103504-fe83dc87aa40.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:golang/github.com/openflagr/flagr

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:golang/github.com/openflagr/flagr. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-rwp9-5g7q-73q3 CVE-2026-0650 CRITICAL OpenFlagr contains an authentication bypass vulnerability in the HTTP middleware

CVE-2026-0650 at a Glance

CVE Identifier CVE-2026-0650
GHSA Identifier GHSA-rwp9-5g7q-73q3
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-425: Direct Request ('Forced Browsing')
Affected Product Github.com/openflagr/flagr
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-0650

To remediate this vulnerability, upgrade all affected Github.com/openflagr/flagr dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/openflagr/flagr fixed: 0.0.0-20251009103504-fe83dc87aa40 
Upgrade github.com/openflagr/flagr to 0.0.0-20251009103504-fe83dc87aa40
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/openflagr/flagr

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-0650, inspect your project dependencies for Github.com/openflagr/flagr:

inspect dependencies for github.com/openflagr/flagr

Analyze the terminal output to locate any version of Github.com/openflagr/flagr in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.0-20251009103504-fe83dc87aa40), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-425: Direct Request ('Forced Browsing'), where the web application does not adequately enforce appropriate authorization on all restricted urls, scripts, or files. In Github.com/openflagr/flagr, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-0650 Affected Github.com/openflagr/flagr Versions

1 component(s)
Fixed Versions:
0.0.0-20251009103504-fe83dc87aa40
Product / Package Ecosystem Affected Versions Fixed Version
github.com/openflagr/flagr
golang/github.com/openflagr/flagr
Go
< 0.0.0-20251009103504-fe83dc87aa40
0.0.0-20251009103504-fe83dc87aa40

References

NVD — CVE-2026-0650 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0650
Security Fix Commit FIX COMMIT
https://github.com/openflagr/flagr/commit/fe83dc87aa404a57554aa5839ac450f55c203570
dreyand.rs/code review/golang/... WEB
https://dreyand.rs/code%20review/golang/2026/01/03/0day-speedrun-openflagr-less-1118-authentication-bypass
Github.com/openflagr/flagr Source Repository REPOSITORY
https://github.com/openflagr/flagr
Github.com/openflagr/flagr Release RELEASE
https://github.com/openflagr/flagr/releases/tag/1.1.19
www.vulncheck.com/advisories/openflag... WEB
https://www.vulncheck.com/advisories/openflagr-authentication-bypass-via-prefix-whitelist-path-normalization

Frequently Asked Questions

What is CVE-2026-0650?
CVE-2026-0650 is a security vulnerability in Github.com/openflagr/flagr involving OpenFlagr contains an authentication bypass vulnerability in the HTTP middleware under CWE-425: Direct Request ('Forced Browsing').
Which Github.com/openflagr/flagr versions are affected?
Affected versions include releases prior to 0.0.0-20251009103504-fe83dc87aa40 across affected packages: github.com/openflagr/flagr.
What version fixes CVE-2026-0650?
Upgrading to 0.0.0-20251009103504-fe83dc87aa40 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/openflagr/flagr affected?
Yes, github.com/openflagr/flagr is affected in releases prior to 0.0.0-20251009103504-fe83dc87aa40. Upgrade your dependency to 0.0.0-20251009103504-fe83dc87aa40 or later.
What CWE is associated with CVE-2026-0650?
CVE-2026-0650 is classified under CWE-425: Direct Request ('Forced Browsing') (The web application does not adequately enforce appropriate authorization on all restricted URLs, scripts, or files.).
How can I check Go dependencies for CVE-2026-0650?
Run the dependency tree command: 'inspect dependencies for github.com/openflagr/flagr'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rwp9-5g7q-73q3",
  "modified" : "2026-01-07T19:31:31Z",
  "published" : "2026-01-07T12:31:25Z",
  "aliases" : [ "CVE-2026-0650" ],
  "summary" : "OpenFlagr contains an authentication bypass vulnerability in the HTTP middleware",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/openflagr/flagr"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.0-20251009103504-fe83dc87aa40"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-0650"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openflagr/flagr/commit/fe83dc87aa404a57554aa5839ac450f55c203570"
  }, {
    "type" : "WEB",
    "url" : "https://dreyand.rs/code%20review/golang/2026/01/03/0day-speedrun-openflagr-less-1118-authentication-bypass"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openflagr/flagr"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openflagr/flagr/releases/tag/1.1.19"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/openflagr-authentication-bypass-via-prefix-whitelist-path-normalization"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-306", "CWE-425" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-01-07T19:31:31Z",
    "nvd_published_at" : "2026-01-07T12:17:07Z"
  }
}