Session swapping via unvalidated OAuth state
Published Jun 2, 2026 · Updated Jun 2, 2026
OAuth login CSRF in NamelessMC Nameless 2.2.4 and earlier allows remote attackers to swap a victim's session via a replayed callback URL. The callback in modules/Core/pages/oauth.php exchanges an authorization code without reading state or comparing it with a value bound to the initiating session. Exploitation requires the victim to have started OAuth login and follow the attacker's callback URL, authenticating that session as the attacker-linked account.
Summary
What happened
OAuth login CSRF in NamelessMC Nameless 2.2.4 and earlier allows remote attackers to swap a victim's session via a replayed callback URL. The callback in modules/Core/pages/oauth.php exchanges an authorization code without reading state or comparing it with a value bound to the initiating session. Exploitation requires the victim to have started OAuth login and follow the attacker's callback URL, authenticating that session as the attacker-linked account.
The record
- CVE
- CVE-2026-34460
- Published
- Jun 2, 2026
- Updated
- Jun 2, 2026
- Vendor
- NamelessMC
- Product
- Nameless
- Classifications
- CWE-302, CWE-352, CWE-346, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 2, 2026CVE publishedPublication date reported by the CVE source.
- Jun 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.2.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GitHub advisory OAuth callback replay PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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