# CVE-2021-21679: Jenkins Azure AD Plugin allows bypassing CSRF protection for any URL

> Attackers can craft URLs to bypass CSRF protection in Jenkins via the Azure AD Plugin, potentially allowing unauthorized actions.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** 31 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-x77r-7m5w-pqq2

## What is CVE-2021-21679?

CVE-2021-21679 is a high-severity vulnerability in Jenkins Azure AD Plugin, published on 31 Aug 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

Jenkins Azure AD Plugin 179.vf6841393099e and earlier allows attackers to craft URLs that would bypass the CSRF protection of any target URL in Jenkins.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2021-21679?

2 open source packages ship an affected version, including org.jenkins-ci.plugins:azure-ad. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.jenkins-ci.plugins:azure-ad` | Maven | All versions | 180.v8b1e80e6f242 |
| `org.jenkins-ci.plugins:azure-ad` | Maven | All versions | 180.v8b1e80e6f242 |

Products: Jenkins Azure Ad.

## How do I fix CVE-2021-21679?

Upgrade org.jenkins-ci.plugins:azure-ad to 180.v8b1e80e6f242 or later.

## Is CVE-2021-21679 being exploited?

There is no known exploitation of CVE-2021-21679 in the wild and no public exploit code.

## Other vulnerabilities in Jenkins Azure AD Plugin

- [CVE-2023-24426](https://insights.sbomify.com/CVE-2023-24426/): Insufficient Session Expiration in Jenkins Azure AD Plugin (high 8.8)
- [CVE-2019-10318](https://insights.sbomify.com/CVE-2019-10318/): Jenkins Azure AD Plugin stored the client secret unencrypted (high 8.8)
- [CVE-2023-41935](https://insights.sbomify.com/CVE-2023-41935/): Non-constant time nonce comparison in Jenkins Microsoft Entra ID (previously Azure AD) Plugin (high 7.5)
- [CVE-2020-2119](https://insights.sbomify.com/CVE-2020-2119/): Client secret transmitted in plain text by Azure AD Plugin (medium 5.3)
- [CVE-2026-42525](https://insights.sbomify.com/CVE-2026-42525/): Jenkins Microsoft Entra ID (previously Azure AD) Plugin has an open redirect vulnerability (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21679 and fix it if it is affected.

What it is: CVE-2021-21679 is a high-severity vulnerability in Jenkins Azure AD Plugin, published on 31 Aug 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-2021-21679 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.jenkins-ci.plugins:azure-ad (Maven): affected all versions; fixed in 180.v8b1e80e6f242
- org.jenkins-ci.plugins:azure-ad (Maven): affected all versions; fixed in 180.v8b1e80e6f242

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-2021-21679/ (Markdown: https://insights.sbomify.com/CVE-2021-21679/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21679
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21679
- OSV: https://osv.dev/vulnerability/CVE-2021-21679

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21679/
Summaries are generated and may contain mistakes; the official description above is the record.