CVE-2023-28848

Name: CVE-2023-28848
Creator: NVD / NIST
Published: 2023-04-04T13:15:08.797+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2023-28848 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.33%

25.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Nextcloud	User Oidc	>= 1.0.0, < 1.3.0

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-52hv-xw32-wf7fVendor Advisory
https://github.com/nextcloud/user_oidc/pull/580Patch, Vendor Advisory
https://hackerone.com/reports/1878381Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-52hv-xw32-wf7fVendor Advisory
https://github.com/nextcloud/user_oidc/pull/580Patch, Vendor Advisory
https://hackerone.com/reports/1878381Third Party Advisory

Timeline

Published: Apr 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-28848?

How severe is CVE-2023-28848?

CVE-2023-28848 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2023-28848?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-28848?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST