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CVE-2026-45278

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

Published: Jun 1, 2026Updated: Jul 20, 2026 Sources: CVE List NVDCWE-601
3.3LOW
NVD MITRE
EPSS Score
0.2%
Top 86.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:NI:LA:N
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-601

Affected Products

nextcloud
oss-project·DEaka nextcloud server
user oidcSaaSSaaS Service
Cloud & SaaS / saas-application
security-advisoriesSaaSSaaS Service
Cloud & SaaS / saas-application

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8wjr-5cg8-4w73
github.com
https://github.com/nextcloud/user_oidc/pull/1273
github.com
https://hackerone.com/reports/3464925
hackerone.com

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