How severe is CVE-2022-39338?

CVE-2022-39338 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2022-39338 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-39338?

CVE-2022-39338 affects Nextcloud Openid Connect User Backend. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-39338?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2022-39338 published?

CVE-2022-39338 was published on 2022-11-25 and last updated on 2026-06-17.

CVE-2022-39338

CVE-2022-39338 is a low-severity vulnerability in Nextcloud Openid Connect User Backend with a CVSS 3.x base score of 3.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Nextcloud Openid Connect User Backend
Published: 2022-11-25
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2022-39338?: CVE-2022-39338 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2022-39338 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-39338?: CVE-2022-39338 affects Nextcloud Openid Connect User Backend. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-39338?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2022-39338 published?: CVE-2022-39338 was published on 2022-11-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:openid_connect_user_backend:*:*:*:*:*:nextcloud:*:*

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