What is CVE-2026-45155?

CVE-2026-45155 is a low-severity vulnerability in Nextcloud Security-advisories, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 2.6/10. Published 2026-06-01.

How severe is CVE-2026-45155?

Low severity. CVSS v3 base score is 2.6 out of 10.

Auth bypass in Nextcloud Security-advisories

CVE-2026-45155

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.7 and 33.0.0 to before 33.0.1, a missing access check on API level allowed to add unknown circles by their ID directly to o…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (7.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.6 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N.

Affected products

Nextcloud Security-advisories — versions >= 32.0.0, < 32.0.7, >= 33.0.0, < 33.0.1

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-45155?: CVE-2026-45155 is a low-severity vulnerability in Nextcloud Security-advisories, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 2.6/10. Published 2026-06-01.
How severe is CVE-2026-45155?: Low severity. CVSS v3 base score is 2.6 out of 10.