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Weakness (CWE) CWE-271 Privilege Dropping / Lowering Errors 1 CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition 1

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TI-2026-20778 CVE-2026-25704 · GHSA-h5vx-6jh5-qhq7

Incomplete privilege drop for com.system76.CosmicGreeter.GetUserData

Priority LOW 25

A Privilege Dropping / Lowering Errors/Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in cosmic-greeter can allow an attacker to regain privileges that should have been dropped and abuse them in the racy…

CVSS 4.0MEDIUM 5.8· Local · Low privileges · No interaction · EPSS 0.00084 · Published 2026-03-30 · Fixed CWE-271

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