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Unauthorized Access Risk from authd Vulnerability in Ubuntu

Unauthorized Access Risk from authd Vulnerability in Ubuntu

First seen 27 Oct 2026, 21:47 UTC • •

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ThreatCluster AI
ThreatCluster •October 28, 2026 at 01:47 UTC
  • •authd vulnerability allows unauthorized file access under certain conditions.
  • •Users must update their systems and restart authd to mitigate the risk.
  • •No active exploitation of the vulnerability has been reported yet.

A vulnerability in authd, the authentication daemon for cloud-based identity providers, could allow unauthorized access to user files. Discovered by Ali Mashally, the flaw arises from improper validation of user identities when matching accounts from identity providers. An attacker could exploit this vulnerability to access another user's local account and sensitive files. The issue affects Ubuntu systems running the affected versions of authd. Users are advised to update their systems to mitigate the risk. A system restart is required after applying the updates. The vulnerability has been documented in Ubuntu Security Notice USN-8957-1. No has been reported as of now.

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Timeline

2026-10-27
Vulnerability disclosed
Ali Mashally discovered a flaw in authd that could allow unauthorized access to user files.
Ubuntu
2026-10-27
Patch released
Ubuntu released updates to address the authd vulnerability, requiring a system restart after installation.
Linuxsecurity

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Common questions

What systems are affected by the authd vulnerability?
The vulnerability affects Ubuntu systems running the affected versions of authd.
What should I do to protect my system?
Update your system to the latest package versions and restart authd after the update.
Is there any evidence of active exploitation?
No active exploitation of the vulnerability has been reported as of now.