# CVE-2026-102489: Zammad GmbH Zammad Session Fixation

> Attackers can hijack sessions to execute remote code as the zammad user in affected helpdesk software versions.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:A/AU:Y/V:C`)
- **Exploited in the wild:** Yes, since 2 Oct 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** GHSA-xmw5-m2wg-4243

## What is CVE-2026-102489?

CVE-2026-102489 is a high-severity authentication bypass vulnerability in Zammad Zammad, published on 30 Sep 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

Zammad versions 6.3.0 to 6.5.4 are vulnerable a session hijack vulnerability that leads to remote code execution as the zammad user. The bug is also present in version 7.0.0 to version 7.1.2, but not exploitable due to changes in the underlying framework.

Weakness: CWE-384 (Session Fixation)

## Which versions are affected by CVE-2026-102489?

It affects 1 product.


Products: Zammad Zammad.

## How do I fix CVE-2026-102489?

No fix has been published for CVE-2026-102489 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 5 Oct 2026.

## Is CVE-2026-102489 being exploited?

Yes. Attackers have exploited CVE-2026-102489 in the wild since at least 2 Oct 2026.

Public exploit code:

- Zammad Session Leak to Remote Code Execution (github_poc): https://github.com/horizon3ai/CVE-2026-102489
- CVE-2026-102489 exploit in golang (github_poc): https://github.com/1xPwn/CVE-2026-102489
- https://github.com/Hunt-Benito/the-cookie-in-the-error-message-cve-2026-102489-zammad-session-hijack-to-rce (github_poc): https://github.com/Hunt-Benito/the-cookie-in-the-error-message-cve-2026-102489-zammad-session-hijack-to-rce

## Other vulnerabilities in Zammad Zammad

- [CVE-2026-102490](https://insights.sbomify.com/CVE-2026-102490/): Zammad GmbH Zammad Improper Privilege Management (high 8.5, exploited in the wild)
- [CVE-2022-48021](https://insights.sbomify.com/CVE-2022-48021/): Code injection in n/a (critical 9.8)
- [CVE-2022-35490](https://insights.sbomify.com/CVE-2022-35490/): Security feature bypass in n/a (critical 9.8)
- [CVE-2021-42090](https://insights.sbomify.com/CVE-2021-42090/): Deserialization in n/a (critical 9.8)
- [CVE-2021-42094](https://insights.sbomify.com/CVE-2021-42094/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-102489 and fix it if it is affected.

What it is: CVE-2026-102489 is a high-severity authentication bypass vulnerability in Zammad Zammad, published on 30 Sep 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: Yes. Attackers have exploited CVE-2026-102489 in the wild since at least 2 Oct 2026.

Affected product: Zammad Zammad. 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-2026-102489/ (Markdown: https://insights.sbomify.com/CVE-2026-102489/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-102489
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-102489
- OSV: https://osv.dev/vulnerability/CVE-2026-102489

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-102489/
Summaries are generated and may contain mistakes; the official description above is the record.