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Nextcloud: Group restriction bypass via bearer token in user_oidc (SETTING_RESTRICT_LOGIN_TO_GROUPS not enforced in Backend::getCurrentUserId)

🗓️ 25 Feb 2026 08:48:24Reported by msatzType 
hackerone
 hackerone
🔗 hackerone.com👁 3 Views

Security bug: browser flow group checks missing in bearer token validation.

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21 May 2026 22:13Current
5.8Medium risk
Vulners AI Score5.8
3