EUVD-2026-33960Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionGitHub Advisory
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.
AnalysisAI
OAuth login CSRF in NamelessMC 2.2.4 and prior enables session swapping by exploiting the absence of server-side state parameter validation during OAuth callback handling. An unauthenticated attacker (PR:N) who controls their own OAuth-linked account can capture a valid callback URL and socially engineer a victim (UI:R) into navigating to it, causing the victim's browser session to become authenticated as the attacker's account - effectively hijacking the victim's logged-in state. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | OAuth login must be enabled and configured on the NamelessMC instance - sites that rely solely on local username/password accounts are not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.4 Medium score reflects a meaningful but bounded impact: AV:N (network-reachable), AC:L (low complexity once the attacker has their callback URL), PR:N (no privileges on the target system), and UI:R (victim must navigate to the crafted URL). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers an account on a target NamelessMC site and links it to an OAuth provider (e.g., Discord or Google). The attacker initiates an OAuth login flow, intercepts or records the resulting callback URL containing the authorization code bound to their own account, and then crafts a phishing email or forum post that causes the victim to visit that callback URL - for example, via an image tag or redirect. … |
| Remediation | The vendor-released patch is NamelessMC version 2.2.5, confirmed by GitHub Security Advisory GHSA-pmpw-2xvh-5xj6 at https://github.com/NamelessMC/Nameless/security/advisories/GHSA-pmpw-2xvh-5xj6. … Detailed patch versions, workarounds, and compensating controls in full report. |
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