Vulnerability in Nextcloud Openid Connect User Backend
CVE-2022-39339
user_oidc is an OpenID Connect user backend for Nextcloud. In versions prior to 1.2.1 sensitive information such as the OIDC client credentials and tokens are sent in plain text of HTTP without TLS. Any malicious actor with access to monitor user traffic may have been able to compromise account security. This issue has been addressed in in user_oidc v1.2.1. Users are advised to upgrade. Users unable to upgrade may use https to access Nextcloud. Set an HTTPS discovery URL in the provider settings (in Nextcloud OIDC admin settings).
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- Nextcloud Openid Connect User Backend
- Nextcloud Security-Advisories — versions < 1.2.1
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-2vff-cq8h-chhg (Patch, Third Party Advisory)
- github.com/nextcloud/user_oidc/pull/495 (Patch, Third Party Advisory)
- hackerone.com/reports/1687005 (Permissions Required, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-39339?
- CVE-2022-39339 is a medium-severity vulnerability in Nextcloud Openid Connect User Backend, classified under Cleartext Transmission of Sensitive Information. CVSS score: 4.3/10. Published 2022-11-25.
- How severe is CVE-2022-39339?
- Medium severity. CVSS v3 base score is 4.3 out of 10.