# CVE-2021-32792: XSS vulnerability when using OIDCPreservePost On in mod_auth_openidc

> Cross-site scripting vulnerability in mod_auth_openidc allows attackers to execute scripts when OIDCPreservePost is enabled.

- **Severity:** Low 3.1 (`CVSS:3.1/AV:N/AC:H/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:** Yes
- **Published:** 26 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** AZL-6482, DEBIAN-CVE-2021-32792, GHSA-458c-7pwg-3j7j, UBUNTU-CVE-2021-32792

## What is CVE-2021-32792?

CVE-2021-32792 is a low-severity cross-site scripting vulnerability in Fedoraproject Fedora, published on 26 Jul 2021. 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

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In mod_auth_openidc before version 2.4.9, there is an XSS vulnerability in when using `OIDCPreservePost On`.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-32792?

It affects 2 products.


Products: Fedoraproject Fedora, Openidc Mod Auth Openidc.

## How do I fix CVE-2021-32792?

Upgrade to a fixed version.

## Is CVE-2021-32792 being exploited?

There is no known exploitation of CVE-2021-32792 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32792 and fix it if it is affected.

What it is: CVE-2021-32792 is a low-severity cross-site scripting vulnerability in Fedoraproject Fedora, published on 26 Jul 2021. 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-2021-32792 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2021-32792/ (Markdown: https://insights.sbomify.com/CVE-2021-32792/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32792
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32792
- OSV: https://osv.dev/vulnerability/CVE-2021-32792

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32792/
Summaries are generated and may contain mistakes; the official description above is the record.