What’s Vulnerable › Vulnerabilities

CVE-2026-34460: NamelessMC: OAuth callback `state` is not validated, allowing login CSRF / session swapping

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-02 · updated 2026-07-22
• Weakness: CWE-302

Description

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 products

• NamelessMC Nameless: before 2.2.5

References

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

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