CVE-2022-39338

Name: CVE-2022-39338
Creator: NVD / NIST
Published: 2022-11-25T19:15:11.45+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2022-39338 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. user_oidc is an OpenID Connect user backend for Nextcloud. Versions prior to 1.2.1 did not properly validate discovery urls which may lead to a stored cross site scripting attack vector. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

user_oidc is an OpenID Connect user backend for Nextcloud. Versions prior to 1.2.1 did not properly validate discovery urls which may lead to a stored cross site scripting attack vector. The impact is limited due to the restrictive CSP that is applied on this endpoint. Additionally this vulnerability has only been shown to be exploitable in the Safari web browser. This issue has been addressed in version 1.2.1. Users are advised to upgrade. Users unable to upgrade should urge their users to avoid using the Safari web browser.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.58%

43.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Openid Connect User Backend	< 1.2.1

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5fpw-795h-rg57Third Party Advisory
https://github.com/nextcloud/user_oidc/pull/496Patch, Third Party Advisory
https://hackerone.com/reports/1687410Permissions Required, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5fpw-795h-rg57Third Party Advisory
https://github.com/nextcloud/user_oidc/pull/496Patch, Third Party Advisory
https://hackerone.com/reports/1687410Permissions Required, Third Party Advisory

Timeline

Published: Nov 25, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-39338?

How severe is CVE-2022-39338?

CVE-2022-39338 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2022-39338?

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-2022-39338?

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

Scan your code now

Source: NVD / NIST