# CVE-2023-31597: Auth bypass in n/a

> Attackers can bypass email verification to manipulate user data and gain unauthorized access to existing tickets in Zammad.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 May 2023
- **Updated:** 22 Jan 2025
- **Also known as:** GHSA-4m8p-xfj4-439m

## What is CVE-2023-31597?

CVE-2023-31597 is a medium-severity authentication bypass vulnerability in Zammad Zammad, published on 18 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue in Zammad v5.4.0 allows attackers to bypass e-mail verification using an arbitrary address and manipulate the data of the generated user. Attackers are also able to gain unauthorized access to existing tickets.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2023-31597?

It affects 1 product.


Products: Zammad Zammad.

## How do I fix CVE-2023-31597?

No fix has been published for CVE-2023-31597 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-31597 being exploited?

There is no known exploitation of CVE-2023-31597 in the wild and no public exploit code.

## Other vulnerabilities in Zammad Zammad

- [CVE-2026-102489](https://insights.sbomify.com/CVE-2026-102489/): Zammad GmbH Zammad Session Fixation (high 8.7, exploited in the wild)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-31597 and fix it if it is affected.

What it is: CVE-2023-31597 is a medium-severity authentication bypass vulnerability in Zammad Zammad, published on 18 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-31597 in the wild and no public exploit code.

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-2023-31597/ (Markdown: https://insights.sbomify.com/CVE-2023-31597/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-31597
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-31597
- OSV: https://osv.dev/vulnerability/CVE-2023-31597

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-31597/
Summaries are generated and may contain mistakes; the official description above is the record.