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Advisory record · GHSA-rphv-h674-5hp2

Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit

CVSS 7.8 HighEPSS 0.0011 · 1st percentile

Published by the GitHub Advisory Database at 8 Apr 2026, 18:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/fleetdm/fleet/v4Go<4.81.14.81.1
Identifiers
GHSA-rphv-h674-5hp2 · CVE-2026-27806 · GO-2026-5634
Weakness (CWE)
CWE-78
Tags
Published
8 Apr 2026
Updated
26 Jun 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Fleet (github.com/fleetdm/fleet/v4) versions before 4.81.1 are affected. In the Orbit agent's FileVault key rotation flow, a user's password is inserted unescaped into a Tcl/expect script, so a password containing a closing brace can inject arbitrary Tcl commands. A local unprivileged user on a managed endpoint could exploit this to run commands as root. Upgrade to Fleet 4.81.1 or later.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.8 High 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0011, the 1st percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:06 UTC First seen by agentprime
  2. 31 Oct 2026, 15:06 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.