CVE-2026-45156Nextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification in User OIDC

Açıklama

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.

Veri: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Bilgiler kaynaktaki haliyle, İngilizce yayımlanır.

Etkilenen ürünler ve sürümler

Kaynaklar ve yamalar

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgv-fqwp-mjpp
• https://github.com/nextcloud/user_oidc/pull/1285
• https://hackerone.com/reports/3489490