Vulnerability Description
Fleet is open source device management software. Prior to version 4.80.1, Fleet trusted client-supplied IP address headers when determining the source IP for incoming requests. This allowed authenticated and unauthenticated clients to spoof their apparent IP address and bypass per-IP rate limiting controls. Fleet determines a client’s public IP address using HTTP headers such as X-Forwarded-For, X-Real-IP, and/or True-Client-IP. These headers were trusted without validation. An attacker could supply arbitrary values in these headers, causing Fleet to treat each request as originating from a different IP address. This could allow an attacker to bypass per-IP rate limits and increase the effectiveness of brute-force or password-spraying attempts against authentication endpoints. This issue does not allow authentication bypass, privilege escalation, data exposure, or remote code execution on its own. Version 4.80.1 contains a patch. As a workaround, run Fleet behind a trusted reverse proxy or load balancer that overwrites client IP headers.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Fleetdm | Fleet | < 4.80.1 |
Related Weaknesses (CWE)
References
- https://github.com/fleetdm/fleet/releases/tag/fleet-v4.80.1Release Notes
- https://github.com/fleetdm/fleet/security/advisories/GHSA-j8h8-75h3-jg53Vendor Advisory
FAQ
What is CVE-2026-24000?
CVE-2026-24000 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Fleet is open source device management software. Prior to version 4.80.1, Fleet trusted client-supplied IP address headers when determining the source IP for incoming requests. This allowed authentica...
How severe is CVE-2026-24000?
CVE-2026-24000 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-24000?
Check the references section above for vendor advisories and patch information. Affected products include: Fleetdm Fleet.