NamelessMC: OAuth callback `state` is not validated, allowing login CSRF / session swapping

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Summary

CVECVE-2026-34460
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-02 16:16:36 UTC
Updated2026-06-02 20:16:34 UTC
DescriptionNamelessMC 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.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS: 0.000140000 probability, percentile 0.026430000 (date 2026-06-03)

Problem Types: CWE-302 | CWE-346 | CWE-352 | CWE-302 CWE-302: Authentication Bypass by Assumed-Immutable Data | CWE-346 CWE-346: Origin Validation Error | CWE-352 CWE-352: Cross-Site Request Forgery (CSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA NamelessMC Nameless affected < 2.2.5 Not specified

References

ReferenceSourceLinkTags
github.com/NamelessMC/Nameless/security/advisories/GHSA-pmpw-2xvh-5xj6 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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