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

> Attackers monitoring network traffic can steal OIDC credentials and tokens due to cleartext transmission, potentially compromising user accounts.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 25 Nov 2022
- **Updated:** 23 Apr 2025
- **Also known as:** GHSA-2vff-cq8h-chhg

## What is CVE-2022-39339?

CVE-2022-39339 is a medium-severity vulnerability in nextcloud security-advisories, published on 25 Nov 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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).

Weakness: CWE-319 (Cleartext Transmission of Sensitive Information)

## Which versions are affected by CVE-2022-39339?

It affects 1 product.


Products: Nextcloud Openid Connect User Backend.

## How do I fix CVE-2022-39339?

No fix has been published for CVE-2022-39339 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-39339 being exploited?

There is no known exploitation of CVE-2022-39339 in the wild and no public exploit code.

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2022-39338](https://insights.sbomify.com/CVE-2022-39338/): Stored cross site scripting (XSS) vulnerability via Authorization Endpoint in user_oidc (low 3.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-39339 and fix it if it is affected.

What it is: CVE-2022-39339 is a medium-severity vulnerability in nextcloud security-advisories, published on 25 Nov 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2022-39339 in the wild and no public exploit code.

Affected product: nextcloud security-advisories. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2022-39339/ (Markdown: https://insights.sbomify.com/CVE-2022-39339/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-39339
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-39339
- OSV: https://osv.dev/vulnerability/CVE-2022-39339

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-39339/
Summaries are generated and may contain mistakes; the official description above is the record.