# CVE-2026-86136: Fireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Variant A

> Low-privileged users can crash the wgagent daemon and read arbitrary files via the management API due to missing authorization checks.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **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:** 29 Sep 2026
- **Updated:** 30 Sep 2026
- **Also known as:** GHSA-34hp-73hm-xf3h

## What is CVE-2026-86136?

CVE-2026-86136 is a high-severity missing authorization vulnerability in Watchguard Fireware, published on 29 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A missing authorization vulnerability in the wgagent management daemon's session initialization function allows an authenticated, low-privileged user (including a read-only or guest administrator account) to crash the wgagent process and read arbitrary files accessible to the daemon by submitting a specially crafted management API request.

Weakness: CWE-862 (Missing Authorization), CWE-476 (NULL Pointer Dereference), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-86136?

It affects 1 product.


Products: Watchguard Fireware.

## How do I fix CVE-2026-86136?

No fix has been published for CVE-2026-86136 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86136 being exploited?

There is no known exploitation of CVE-2026-86136 in the wild and no public exploit code.

## Other vulnerabilities in Watchguard Fireware

- [CVE-2022-26318](https://insights.sbomify.com/CVE-2022-26318/): WatchGuard Firebox and XTM Appliances Arbitrary Code Execution (critical 9.8, exploited in the wild)
- [CVE-2025-14733](https://insights.sbomify.com/CVE-2025-14733/): WatchGuard Firebox Out of Bounds Write (critical 9.3, exploited in the wild)
- [CVE-2025-9242](https://insights.sbomify.com/CVE-2025-9242/): WatchGuard Firebox Out-of-Bounds Write (critical 9.3, exploited in the wild)
- [CVE-2022-23176](https://insights.sbomify.com/CVE-2022-23176/): WatchGuard Firebox and XTM Privilege Escalation (high 8.8, exploited in the wild)
- [CVE-2022-31789](https://insights.sbomify.com/CVE-2022-31789/): Integer overflow in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86136 and fix it if it is affected.

What it is: CVE-2026-86136 is a high-severity missing authorization vulnerability in Watchguard Fireware, published on 29 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-86136 in the wild and no public exploit code.

Affected product: Watchguard Fireware. 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-2026-86136/ (Markdown: https://insights.sbomify.com/CVE-2026-86136/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86136
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86136
- OSV: https://osv.dev/vulnerability/CVE-2026-86136

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86136/
Summaries are generated and may contain mistakes; the official description above is the record.