# CVE-2026-16198: Sipeed PicoClaw First Run Setup access_control.go authentication bypass

> Remote attackers can bypass authentication in Sipeed PicoClaw First Run Setup by manipulating allowed_cidrs, requiring a patch to secure the device.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/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:** 18 Jul 2026
- **Updated:** 21 Jul 2026
- **Also known as:** GHSA-367p-r6p3-qqmv

## What is CVE-2026-16198?

CVE-2026-16198 is a medium-severity authentication bypass vulnerability in Sipeed PicoClaw, published on 18 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was detected in Sipeed PicoClaw up to 0.2.9. The impacted element is an unknown function of the file web/backend/middleware/access_control.go of the component First Run Setup. Performing a manipulation of the argument allowed_cidrs results in authentication bypass using alternate channel. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is regarded as difficult. The exploit is now public and may be used. The patch is named 017601354be38cb027ff3ffb01aed79bd5d12610. Applying a patch is the recommended action to fix this issue.

Weakness: CWE-288 (Authentication Bypass Using an Alternate Path or Channel), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-16198?


## How do I fix CVE-2026-16198?

No fix has been published for CVE-2026-16198 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-16198 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16198 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-16198 and fix it if it is affected.

What it is: CVE-2026-16198 is a medium-severity authentication bypass vulnerability in Sipeed PicoClaw, published on 18 Jul 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-2026-16198 exists.

Affected product: Sipeed PicoClaw. 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-2026-16198/ (Markdown: https://insights.sbomify.com/CVE-2026-16198/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-16198
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-16198
- OSV: https://osv.dev/vulnerability/CVE-2026-16198

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-16198/
Summaries are generated and may contain mistakes; the official description above is the record.