# CVE-2023-2534: Information disclouse and DoS via websocket push events

> Authenticated agents can track user behavior and cause server performance issues due to improper authorization in the websocket API.

- **Severity:** High 7.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 May 2023
- **Updated:** 29 Jan 2025
- **Also known as:** GHSA-67qg-pjv2-pg9v

## What is CVE-2023-2534?

CVE-2023-2534 is a high-severity missing authorization vulnerability in Otrs Otrs, published on 8 May 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Improper Authorization vulnerability in OTRS AG OTRS 8 (Websocket API backend) allows any as Agent authenticated attacker to track user behaviour and to gain live insight into overall system usage. User IDs can easily be correlated with real names e. g. via
ticket histories by any user. (Fuzzing for garnering other adjacent user/sensitive data). Subscribing to all possible push events could also lead to performance implications on the server side, depending on the size of the installation
and the number of active users. (Flooding)This issue affects OTRS: from 8.0.X before 8.0.32.

Weakness: CWE-863 (Incorrect Authorization), CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2023-2534?

It affects 1 product.


Products: Otrs Otrs.

## How do I fix CVE-2023-2534?

No fix has been published for CVE-2023-2534 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-2534 being exploited?

There is no known exploitation of CVE-2023-2534 in the wild and no public exploit code.

## Other vulnerabilities in Otrs Otrs

- [CVE-2026-48188](https://insights.sbomify.com/CVE-2026-48188/): SQL Injection via MySQL Quote Method (critical 9.1)
- [CVE-2013-4717](https://insights.sbomify.com/CVE-2013-4717/): SQL injection in n/a (high 8.8)
- [CVE-2017-14635](https://insights.sbomify.com/CVE-2017-14635/): Code injection in n/a (high 8.8)
- [CVE-2023-5422](https://insights.sbomify.com/CVE-2023-5422/): SSL Certificates are not checked for E-Mail Handling (high 8.7)
- [CVE-2023-6254](https://insights.sbomify.com/CVE-2023-6254/): Password is send back to client (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-2534 and fix it if it is affected.

What it is: CVE-2023-2534 is a high-severity missing authorization vulnerability in Otrs Otrs, published on 8 May 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-2534 in the wild and no public exploit code.

Affected product: Otrs Otrs. 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-2023-2534/ (Markdown: https://insights.sbomify.com/CVE-2023-2534/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-2534
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-2534
- OSV: https://osv.dev/vulnerability/CVE-2023-2534

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-2534/
Summaries are generated and may contain mistakes; the official description above is the record.