CVE-2023-28848

CSRF protection on user_oidc login returned the expected token in case of an error

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.

Category

4.8
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.43%
Vendor Advisory github.com Vendor Advisory github.com
Affected: nextcloud security-advisories
Published at:
Updated at:

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 patch vendor advisory
https://hackerone.com/reports/1878381 third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-28848?
CVE-2023-28848 has been scored as a medium severity vulnerability.
How to fix CVE-2023-28848?
To fix CVE-2023-28848, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-28848 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-28848 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-28848?
CVE-2023-28848 affects nextcloud security-advisories.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.