Vulnerability · Published Jun 2, 2026 · Assigned by GitHub_M

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

Medium 5.4

In plain English

A medium-severity cross-site request forgery in Nameless from NamelessMC. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.1%top 98.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
NamelessMC	Nameless	< 2.2.5

Weakness: CWE-302, CWE-346, CWE-352 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References

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