# CVE-2026-78434: Faveo Helpdesk post-ticket-reply Endpoint FormController.php post_ticket_reply missing authentication

> Remote attackers can submit ticket replies without authentication due to missing checks in the post-ticket-reply endpoint.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Aug 2026
- **Updated:** 25 Aug 2026
- **Also known as:** GHSA-j3fx-x2vv-hrr9

## What is CVE-2026-78434?

CVE-2026-78434 is a medium-severity missing authorization vulnerability in Faveo Helpdesk, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw has been found in Faveo Helpdesk up to 2.0.3. This impacts the function FormController::post_ticket_reply of the file app/Http/Controllers/Client/helpdesk/FormController.php of the component post-ticket-reply Endpoint. This manipulation causes missing authentication. The attack can be initiated remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-306 (Missing Authentication for Critical Functionality), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-78434?


## How do I fix CVE-2026-78434?

No fix has been published for CVE-2026-78434 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-78434 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78434 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-78434 and fix it if it is affected.

What it is: CVE-2026-78434 is a medium-severity missing authorization vulnerability in Faveo Helpdesk, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78434 exists.

Affected product: Faveo Helpdesk. 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-2026-78434/ (Markdown: https://insights.sbomify.com/CVE-2026-78434/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-78434
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78434
- OSV: https://osv.dev/vulnerability/CVE-2026-78434

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-78434/
Summaries are generated and may contain mistakes; the official description above is the record.