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SCA: security update for github.com/fleetdm/fleet (GHSA-mxmp-wr3w-rvqx)

medium Tenable Self-Hosted Container Security Plugin ID 441837

Description

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

 - Fleet is open source device management software. Prior to version 4.80.1, a vulnerability in Fleet's IP
 extraction logic allows unauthenticated attackers to bypass API rate limiting by spoofing client IP
 headers. This may allow brute-force login attempts or other abuse against Fleet instances exposed to the
 public internet. Fleet extracted client IP addresses from request headers (`True-Client-IP`, `X-Real-IP`,
 `X-Forwarded-For`) without validating that those headers originate from a trusted proxy. The extracted IP
 is used as the key for rate limiting and IP ban decisions. As a result, an attacker could rotate the value
 of these headers on each request, causing Fleet to treat each attempt as coming from a different client.
 This effectively bypasses per-IP rate limits on sensitive endpoints such as the login API, enabling
 unrestricted brute-force or credential stuffing attacks. This issue primarily affects Fleet instances that
 are directly exposed to the internet without a reverse proxy that overwrites forwarded-IP headers.
 Instances behind a properly configured proxy or WAF are less affected. Version 4.80.1 contains a patch. If
 an immediate upgrade is not possible, administrators should ensure Fleet is deployed behind a reverse
 proxy (e.g., nginx, Cloudflare, AWS ALB) that overwrites `X-Forwarded-For` with the true client IP, and
 apply rate limiting at the proxy or WAF layer. (CVE-2026-46356)

Solution

Update the github.com/fleetdm/fleet library and its related packages to version 4.80.1 or later.

See Also

https://github.com/advisories/GHSA-mxmp-wr3w-rvqx

Plugin Details

Severity: Medium

ID: 441837

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 5/14/2026

Updated: 6/1/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.8

Percentile: 96.67

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-46356

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 2.7

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/14/2026

Vulnerability Publication Date: 5/14/2026

Reference Information

CVE: CVE-2026-46356

cwe: CWE-290