Vulnerability record · CVE-2023-28848 · published 4 April 2023

CVE-2023-28848: Nextcloud user oidc cross-site request forgery vulnerability

Nextcloud · User Oidc

user_oidc is the OIDC connect user backend for Nextcloud, an open source collaboration platform. A vulnerability in versions 1.0.0 until 1.3.0 effectively allowed an attacker to bypass the state protection as they could just copy the expected state token from the first request to their second request. Users should upgrade user_oidc to 1.3.0 to receive a patch for the issue. No known workarounds are available.

5.4 CVSS 3.1 Medium EPSS 0.33% · top 76.1% CWE-352 · Cross-site request forgery

5.4CVSS 3.1 base score

0.33%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References

17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

User Oidc Nextcloud

References

Link	Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-52hv-xw32-wf7f	Vendor Advisory
https://github.com/nextcloud/user_oidc/pull/580	PatchVendor Advisory
https://hackerone.com/reports/1878381	Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-52hv-xw32-wf7f	Vendor Advisory
https://github.com/nextcloud/user_oidc/pull/580	PatchVendor Advisory
https://hackerone.com/reports/1878381	Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-32074Nextcloud user oidc improper restriction of authentication attempts vulnerabilityuser_oidc app is an OpenID Connect user backend for Nextcloud. Authentication can be broken/bypassed in user_oidc app. It is recommended that the Nex…EPSS 0.85%25 May 2023 8.8CVE-2026-45284Nextcloud user oidc improper access control vulnerabilityNextcloud is an open source content collaboration platform. From version 1.3.6 to before version 8.4.0, an improper check allowed users that where pr…EPSS 0.36%1 Jun 2026 8.1CVE-2023-39954Nextcloud user oidc missing encryption vulnerabilityuser_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version 1.0.0 and prior to version 1.3.3, …EPSS 0.44%10 Aug 2023 6.3CVE-2024-37312Nextcloud user oidc improper access control vulnerabilityuser_oidc app is an OpenID Connect user backend for Nextcloud. Missing access control on the ID4me endpoint allows an attacker to register an account…EPSS 0.64%14 Jun 2024 6.1CVE-2026-45278Nextcloud user oidc open redirect vulnerabilityNextcloud 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 redire…EPSS 0.32%1 Jun 2026 6.1CVE-2024-52512Nextcloud user oidc open redirect vulnerabilityuser_oidc app is an OpenID Connect user backend for Nextcloud. A malicious user could send a malformed login link that would redirect the user to a p…EPSS 0.42%15 Nov 2024 4.8CVE-2023-39953Nextcloud user oidc vulnerabilityuser_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version 1.0.0 and prior to version 1.3.3, …EPSS 0.54%10 Aug 2023 4.7CVE-2024-37886Nextcloud user oidc improper verification of cryptographic signature vulnerabilityuser_oidc app is an OpenID Connect user backend for Nextcloud. An attacker could potentially trick the app into accepting a request that is not signe…EPSS 0.24%14 Jun 2024

Source: NIST National Vulnerability Database (record CVE-2023-28848), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.