What is CVE-2026-77166?

CVE-2026-77166 is a low-severity vulnerability in Nextcloud Collectives, classified under CWE-840. CVSS score: 2.4/10. Published 2026-09-21.

How severe is CVE-2026-77166?

Low severity. CVSS v3 base score is 2.4 out of 10.

Vulnerability in Nextcloud Collectives

CVE-2026-77166

The emoji field in the page emoji update endpoint does not properly validate user input. By injecting long text and line breaks, the sidebar layout becomes broken and can hide other items.

CVSS v3 metric

CVSS v3 base score 2.4 (Low). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N.

Affected products

Nextcloud Collectives

Weakness classification (CWE)

CWE-840

References

support@hackerone.com

Frequently asked questions

What is CVE-2026-77166?: CVE-2026-77166 is a low-severity vulnerability in Nextcloud Collectives, classified under CWE-840. CVSS score: 2.4/10. Published 2026-09-21.
How severe is CVE-2026-77166?: Low severity. CVSS v3 base score is 2.4 out of 10.