What is CVE-2022-39338?

CVE-2022-39338 is a low-severity vulnerability in Nextcloud Openid Connect User Backend, classified under Improper Input Validation. CVSS score: 3.5/10. Published 2022-11-25.

How severe is CVE-2022-39338?

Low severity. CVSS v3 base score is 3.5 out of 10.

XSS in Nextcloud Openid Connect User Backend

CVE-2022-39338

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.006 (44.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N.

Affected products

Nextcloud Openid_connect_user_backend
Nextcloud Security-advisories — versions < 1.2.1

Weakness classification (CWE)

References

security-advisories@github.com (Third Party Advisory)
security-advisories@github.com (Patch, Third Party Advisory)
security-advisories@github.com (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2022-39338?: CVE-2022-39338 is a low-severity vulnerability in Nextcloud Openid Connect User Backend, classified under Improper Input Validation. CVSS score: 3.5/10. Published 2022-11-25.
How severe is CVE-2022-39338?: Low severity. CVSS v3 base score is 3.5 out of 10.