CVE-2026-45278 LOW

CVE-2026-45278: Nextcloud: Open Redirect in user_oidc login flow via protocol-relative URL bypass

Vendor Nextcloud
Product security-advisories
Weakness CWE-601 · Open redirect
Published June 1, 2026
Last update June 2, 2026
View on NVD All CVEs

CVSS base score

3.3/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality None
Integrity Low

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

What the vulnerability does

01Description

Nextcloud is an open source content collaboration platform. From version 6.1.0 to before version 8.2.2, an attacker can craft links that would redirect users to another website, when the victim uses the attackers link to log in via user OIDC. This issue has been patched in version 8.2.2.

Key dates

02Disclosure timeline

June 1, 2026 CVE published
June 2, 2026 Record updated