Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M
CVE-2026-34227Sliver One-Click Remote Access: Insecure CORS & Unauthenticated MCP Interface
Medium 5.9
In plain English
A medium-severity missing authentication in sliver from BishopFox. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/bishopfox/sliver | 1.7.4 | GHSA-6fpf-248c-m7wm |
| Go | github.com/bishopfox/sliver | 1.7.4 | GO-2026-5175 |
Affected products (as reported)
Weakness: CWE-306, CWE-942 · 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
References
- https://github.com/BishopFox/sliver/security/advisories/GHSA-6fpf-248c-m7wm x_refsource_CONFIRM