What’s Vulnerable › Vulnerabilities

CVE-2026-25704: Incomplete privilege drop for com.system76.CosmicGreeter.GetUserData

• Severity: medium (CVSS 5.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-30 · updated 2026-06-17
• Weakness: CWE-271

Description

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 checking logic. This issue affects cosmic-greeter before https://github.Com/pop-os/cosmic-greeter/pull/426.

References

• https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-25704
• http://www.openwall.com/lists/oss-security/2026/04/16/3

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