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CVE-2026-34460

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

Published: Jun 2, 2026Updated: Jun 2, 2026 Sources: CVE List
NVD MITRE
5.4CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None

Weaknesses

CWE-302CWE-302: Authentication Bypass by Assumed-Immutable DataCWE-346CWE-346: Origin Validation ErrorCWE-352CWE-352: Cross-Site Request Forgery (CSRF)

Affected Products

Nameless
NamelessMC

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

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

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