Detections
Analytics

SCA: security update for github.com/fleetdm/fleet/v4 (GHSA-w3wf-cfx3-6gcx)

critical Tenable Self-Hosted Container Security Plugin ID 433637

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Fleet is an open source osquery manager. In Fleet before version 3.5.1, due to issues in Go's standard
 library XML parsing, a valid SAML response may be mutated by an attacker to modify the trusted document.
 This can result in allowing unverified logins from a SAML IdP. Users that configure Fleet with SSO login
 may be vulnerable to this issue. This issue is patched in 3.5.1. The fix was made using
 https://github.com/mattermost/xml-roundtrip-validator If upgrade to 3.5.1 is not possible, users should
 disable SSO authentication in Fleet. (CVE-2020-26276)

See Also

https://github.com/advisories/GHSA-w3wf-cfx3-6gcx

Plugin Details

Severity: Critical

ID: 433637

Version: Revision 1.3

Type: Local

Family: SCA Checks

Published: 8/19/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.12

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2020-26276

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 2/11/2022

Vulnerability Publication Date: 12/17/2020

Reference Information

CVE: CVE-2020-26276

cwe: CWE-290