# CVE-2026-84652: Auth bypass in Jenkins

> Attackers can hijack user sessions by exploiting missing session rotation during 'remember me' authentication, leading to unauthorized access.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 2 Sep 2026
- **Updated:** 3 Sep 2026
- **Also known as:** BIT-jenkins-2026-84652, GHSA-42rh-v5qm-8p5w, MINI-6xvq-q6vm-j2m2, MINI-jgx2-jxhc-3v7j, MINI-q5mp-q372-5q59, MINI-v42j-hq2j-c73r, MINI-x3gq-fqxc-c2h2, MINI-x5hv-25xw-pc3v, MINI-x99m-4468-qrf3

## What is CVE-2026-84652?

CVE-2026-84652 is a high-severity authentication bypass vulnerability in Jenkins Jenkins, published on 2 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, Jenkins does not rotate the session when a user is authenticated via the "remember me" cookie, allowing attackers able to serve content on the same site as Jenkins to set a known session cookie in the victim's browser, which after the victim authenticates via the "remember me" cookie, grants the attacker access to Jenkins as that user.

Weakness: CWE-384 (Session Fixation)

## Which versions are affected by CVE-2026-84652?

1 open source package ship an affected version, including jenkins. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `jenkins` | Bitnami | All versions | 2.568.3, 2.580.0 |

Products: Jenkins Jenkins.

## How do I fix CVE-2026-84652?

Upgrade jenkins to a fixed version for your release line: 2.568.3 or 2.580.0.

## Is CVE-2026-84652 being exploited?

There is no known exploitation of CVE-2026-84652 in the wild and no public exploit code.

## Other vulnerabilities in Jenkins Jenkins

- [CVE-2024-23897](https://insights.sbomify.com/CVE-2024-23897/): Jenkins Command Line Interface (CLI) Path Traversal (critical 9.8, exploited in the wild)
- [CVE-2018-1000861](https://insights.sbomify.com/CVE-2018-1000861/): Jenkins Stapler Web Framework Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2017-1000353](https://insights.sbomify.com/CVE-2017-1000353/): Jenkins Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2015-5317](https://insights.sbomify.com/CVE-2015-5317/): Jenkins User Interface (UI) Information Disclosure (high 7.5, exploited in the wild)
- [CVE-2021-21690](https://insights.sbomify.com/CVE-2021-21690/): Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-84652 and fix it if it is affected.

What it is: CVE-2026-84652 is a high-severity authentication bypass vulnerability in Jenkins Jenkins, published on 2 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-84652 in the wild and no public exploit code.

Affected packages and fixed versions:
- jenkins (Bitnami): affected all versions; fixed in 2.568.3, 2.580.0

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-2026-84652/ (Markdown: https://insights.sbomify.com/CVE-2026-84652/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-84652
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84652
- OSV: https://osv.dev/vulnerability/CVE-2026-84652

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-84652/
Summaries are generated and may contain mistakes; the official description above is the record.