# CVE-2026-78356: Unauthenticated Disclosure of Agent Frontend Configuration

> Unauthenticated attackers can access the OTRS Agent Frontend configuration endpoint to retrieve internal application settings and implementation details.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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:** 12 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-8jjm-2gpw-mmqf, UBUNTU-CVE-2026-78356

## What is CVE-2026-78356?

CVE-2026-78356 is a medium-severity vulnerability in OTRS, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The OTRS Agent Frontend configuration endpoint can be accessed without authentication. This allows unauthenticated remote users to retrieve internal application configuration that is intended for use by the authenticated Agent Frontend. The exposed information may include configured frontend routes and their associated authorization groups, authentication configuration, enabled product features, third-party integration settings, and other implementation details.

The exposed configuration does not directly contain user credentials or provide unauthorized modification of the OTRS configuration. However, the disclosed information may assist an attacker in fingerprinting the affected OTRS installation and identifying enabled functionality or security-relevant configuration that could be used to prepare further attacks.

This issue affects OTRS:

  *  8.0.X
  *  2023.X
  *  2024.X
  *  2025.X
  *  2026.X before 2026.7.X

Weakness: CWE-497 (Exposure of Sensitive System Information to an Unauthorized Control Sphere)

## Which versions are affected by CVE-2026-78356?


## How do I fix CVE-2026-78356?

No fix has been published for CVE-2026-78356 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-78356 being exploited?

There is no known exploitation of CVE-2026-78356 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-78356 and fix it if it is affected.

What it is: CVE-2026-78356 is a medium-severity vulnerability in OTRS, published on 12 Oct 2026. 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-2026-78356 in the wild and no public exploit code.

Affected product: 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-2026-78356/ (Markdown: https://insights.sbomify.com/CVE-2026-78356/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-78356
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78356
- OSV: https://osv.dev/vulnerability/CVE-2026-78356

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-78356/
Summaries are generated and may contain mistakes; the official description above is the record.