NamelessMC Nameless up to 2.2.4 state authentication bypass by assumed-immutable data

Summaryinfo

A vulnerability classified as critical has been found in NamelessMC Nameless up to 2.2.4. This impacts an unknown function. The manipulation of the argument state leads to authentication bypass by assumed-immutable data. This vulnerability is listed as CVE-2026-34460. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in NamelessMC Nameless up to 2.2.4. This issue affects some unknown processing. The manipulation of the argument state with an unknown input leads to a authentication bypass by assumed-immutable data vulnerability. Using CWE to declare the problem leads to CWE-302. The authentication scheme or implementation uses key data elements that are assumed to be immutable, but can be controlled or modified by the attacker. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

NamelessMC is website software for Minecraft servers. In versions 2.2.4 and prior, the OAuth callback handling does not validate the state parameter server-side before exchanging the authorization code. This allows an attacker to capture a valid OAuth callback URL for their own account and cause a victim's browser to navigate to it, resulting in the victim's session being authenticated as the attacker-linked account (OAuth login CSRF / session swapping). This is patched in version 2.2.5.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-34460 since 03/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.2.5 eliminates this vulnerability.

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Productinfo

Vendor

• NamelessMC

Name

• Nameless

Version

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4

Website

• Product: https://github.com/NamelessMC/Nameless/

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