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Tool Directory

CVE-2026-45156

HighPublished

Nextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification in User OIDC

Published: Jun 1, 2026
Updated: Jun 3, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

8.1/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 35.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to before 5.1.0, and 6.0.0 to before 6.4.0, a missing signature verification in User OIDC allowed a malicious ID4me authority to identify as any user. This issue has been patched in versions 3.1.0, 4.1.0, 5.1.0, 6.4.0 and 8.3.0.

Sources

CVE-2026-45156-POCExploit
This repository contains the Proof of Concept (PoC) exploit script for CVE-2026-45156

Responsible use

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