CVE-2026-0650: Github.com/openflagr/flagr Authentication Bypass Vulnerability
CRITICALCVE-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.
CVE-2026-0650 at a Glance
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.
Upgrade github.com/openflagr/flagr to 0.0.0-20251009103504-fe83dc87aa40Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/openflagr/flagrHow 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/flagrAnalyze 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
CVE-2026-0650 Affected Github.com/openflagr/flagr Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/openflagr/flagr
|
Go |
< 0.0.0-20251009103504-fe83dc87aa40
|
0.0.0-20251009103504-fe83dc87aa40
|
References
Frequently Asked Questions
What is CVE-2026-0650?
Which Github.com/openflagr/flagr versions are affected?
What version fixes CVE-2026-0650?
Is github.com/openflagr/flagr affected?
What CWE is associated with CVE-2026-0650?
How can I check Go dependencies for CVE-2026-0650?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"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"
}
}