Detections
Analytics

SCA: security update for fastmcp (GHSA-rww4-4w9c-7733)

high Tenable Self-Hosted Container Security Plugin ID 439576

Description

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

 - FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, while testing the
 GitHubProvider OAuth integration, which allows authentication to a FastMCP MCP server via a FastMCP
 OAuthProxy using GitHub OAuth, it was discovered that the FastMCP OAuthProxy does not properly validate
 the user's consent upon receiving the authorization code from GitHub. In combination with GitHub’s
 behavior of skipping the consent page for previously authorized clients, this introduces a Confused Deputy
 vulnerability. This issue has been patched in version 3.2.0. (CVE-2026-27124)

Solution

Update the fastmcp library and its related packages to version 3.2.0 or later.

See Also

https://github.com/advisories/GHSA-rww4-4w9c-7733

Plugin Details

Severity: High

ID: 439576

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 4/1/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.42

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2026-27124

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.5

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

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

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 6.9

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/31/2026

Vulnerability Publication Date: 3/31/2026

Reference Information

CVE: CVE-2026-27124

cwe: CWE-441