What’s Vulnerable › Vulnerabilities

CVE-2022-39339: Cleartext Transmission of Sensitive Information in user_oidc

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-11-25 · updated 2026-06-17
• Weakness: CWE-319

Description

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).

Affected products

• nextcloud Openid Connect User Backend: before 1.2.1 — fixed in 1.2.1

How to fix

Upgrade to a fixed version: nextcloud Openid Connect User Backend 1.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2vff-cq8h-chhg
• https://github.com/nextcloud/user_oidc/pull/495
• https://hackerone.com/reports/1687005
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2vff-cq8h-chhg
• https://github.com/nextcloud/user_oidc/pull/495
• https://hackerone.com/reports/1687005

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