Open Redirect in Nextcloud Security-Advisories
CVE-2026-45278
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.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Nextcloud Security-Advisories — versions >= 6.1.0, < 8.2.2
- Nextcloud User Oidc
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-8wjr-5cg8-4w73 (Vendor Advisory)
- github.com/nextcloud/user_oidc/pull/1273 (Patch, Issue Tracking)
- hackerone.com/reports/3464925 (Permissions Required)
Frequently asked questions
- What is CVE-2026-45278?
- CVE-2026-45278 is a low-severity vulnerability in Nextcloud Security-Advisories, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.3/10. Published 2026-06-01.
- How severe is CVE-2026-45278?
- Low severity. CVSS v3 base score is 3.3 out of 10.