CVE-2022-39338 Stored cross site scripting (XSS) vulnerability via Authorization Endpoint in user_oidc
Stored XSS in Nextcloud user_oidc allows attackers to execute scripts in Safari via unvalidated discovery URLs, mitigated by upgrading.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2022-39338?
CVE-2022-39338 is a low-severity cross-site scripting vulnerability in nextcloud security-advisories, published on 25 Nov 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2022-39338?
It affects 1 product.
Products include Nextcloud Openid Connect User Backend.
How do I fix CVE-2022-39338?
No fix has been published for CVE-2022-39338 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2022-39338 being exploited?
There is no known exploitation of CVE-2022-39338 in the wild and no public exploit code.
Other vulnerabilities in nextcloud security-advisories
Sources
Also known as GHSA-5fpw-795h-rg57.