Vulnerability · Published Jun 1, 2026 · Assigned by GitHub_M
CVE-2026-45278Nextcloud: Open Redirect in user_oidc login flow via protocol-relative URL bypass
Low 3.3
In plain English
A low-severity open redirect in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).
Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.2%top 85.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextcloud | security-advisories | >= 6.1.0, < 8.2.2 |
Weakness: CWE-601 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8wjr-5cg8-4w73 x_refsource_CONFIRM
- https://github.com/nextcloud/user_oidc/pull/1273 x_refsource_MISC
- https://hackerone.com/reports/3464925 x_refsource_MISC