CVE-2026-34460

Summary

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.

Affected Software

Weaknesses

• 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)

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/NamelessMC/Nameless/security/advisories/GHSA-pmpw-2xvh-5xj6

References

• https://github.com/NamelessMC/Nameless/security/advisories/GHSA-pmpw-2xvh-5xj6

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