What is CVE-2026-77172?

CVE-2026-77172 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Privilege Management. CVSS score: 5.3/10. Published 2026-10-27.

How severe is CVE-2026-77172?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Privilege escalation in Nextcloud Server

CVE-2026-77172

App passwords were allowed to bypass password confirmation on sensitive endpoints.

Vulnerability class: Privilege Escalation

Published 2026-10-27.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Nextcloud Server

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

hackerone.com/reports/3566607

Frequently asked questions

What is CVE-2026-77172?: CVE-2026-77172 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Privilege Management. CVSS score: 5.3/10. Published 2026-10-27.
How severe is CVE-2026-77172?: Medium severity. CVSS v3 base score is 5.3 out of 10.