How severe is CVE-2026-25704?

CVE-2026-25704 has a CVSS 4.0 base score of 5.8, rated medium severity.

Is CVE-2026-25704 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-25704?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-25704 have an EU (EUVD) identifier?

Yes. CVE-2026-25704 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17067.

When was CVE-2026-25704 published?

CVE-2026-25704 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-25704

CVE-2026-25704 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-271.

Key facts

Severity: Medium (CVSS 4.0 base score 5.8)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17067
Weakness: CWE-271
Published: 2026-03-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-25704?: 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.
How severe is CVE-2026-25704?: CVE-2026-25704 has a CVSS 4.0 base score of 5.8, rated medium severity.
Is CVE-2026-25704 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-25704?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25704 have an EU (EUVD) identifier?: Yes. CVE-2026-25704 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17067.
When was CVE-2026-25704 published?: CVE-2026-25704 was published on 2026-03-30 and last updated on 2026-06-17.

References

Other CWE-271 vulnerabilities

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CVE-2025-23395 — High (CVSS 7.8): Screen 5.0.0 when it runs with setuid-root privileges does not drop privileges while operating on a user supplied path.…
CVE-2022-3569 — High (CVSS 7.8): Due to an issue with incorrect sudo permissions, Zimbra Collaboration Suite (ZCS) suffers from a local privilege…
CVE-2026-35535 — High (CVSS 7.4): In Sudo through 1.9.17p2 before 3e474c2, a failure of a setuid, setgid, or setgroups call, during a privilege drop…

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