# CVE-2026-42525: Jenkins Microsoft Entra ID (previously Azure AD) Plugin has an open redirect vulnerability

> Attackers can exploit an unrestricted redirect URL in the Jenkins Microsoft Entra ID plugin to conduct phishing attacks against users.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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:** 29 Apr 2026
- **Updated:** 29 Apr 2026
- **Also known as:** GHSA-jp6g-g3v3-6gvf

## What is CVE-2026-42525?

CVE-2026-42525 is a medium-severity vulnerability in Jenkins Microsoft Entra ID (previously Azure AD) Plugin, published on 29 Apr 2026. 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 Microsoft Entra ID (previously Azure AD) Plugin 666.v6060de32f87d and earlier does not restrict the redirect URL after login, allowing attackers to perform phishing attacks.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2026-42525?

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 | 667.v4c5827a |
| `org.jenkins-ci.plugins:azure-ad` | Maven | All versions | 667.v4c5827a |

Products: Jenkins Azure Ad.

## How do I fix CVE-2026-42525?

Upgrade org.jenkins-ci.plugins:azure-ad to 667.v4c5827a or later.

## Is CVE-2026-42525 being exploited?

There is no known exploitation of CVE-2026-42525 in the wild and no public exploit code.

## Other vulnerabilities in Jenkins Microsoft Entra ID (previously 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-2021-21679](https://insights.sbomify.com/CVE-2021-21679/): Jenkins Azure AD Plugin allows bypassing CSRF protection for any URL (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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-42525 and fix it if it is affected.

What it is: CVE-2026-42525 is a medium-severity vulnerability in Jenkins Microsoft Entra ID (previously Azure AD) Plugin, published on 29 Apr 2026. 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-2026-42525 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 667.v4c5827a
- org.jenkins-ci.plugins:azure-ad (Maven): affected all versions; fixed in 667.v4c5827a

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-2026-42525/ (Markdown: https://insights.sbomify.com/CVE-2026-42525/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42525
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42525
- OSV: https://osv.dev/vulnerability/CVE-2026-42525

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-42525/
Summaries are generated and may contain mistakes; the official description above is the record.