OpenFlagr up to 1.1.18 HTTP Middleware missing authentication

Summaryinfo

A vulnerability classified as critical has been found in OpenFlagr Flagr up to 1.1.18. Affected by this vulnerability is an unknown functionality of the component HTTP Middleware. The manipulation leads to missing authentication. This vulnerability is traded as CVE-2026-0650. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in OpenFlagr Flagr up to 1.1.18. This issue affects some unknown processing of the component HTTP Middleware. The manipulation with an unknown input leads to a missing authentication vulnerability. Using CWE to declare the problem leads to CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was shared by DreyAnd. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-0650 since 01/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/07/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• OpenFlagr

Name

• Flagr

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.1.7
• 1.1.8
• 1.1.9
• 1.1.10
• 1.1.11
• 1.1.12
• 1.1.13
• 1.1.14
• 1.1.15
• 1.1.16
• 1.1.17
• 1.1.18

Website

• Product: https://github.com/openflagr/flagr/

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