PT-2026-53896 · Rancher · Fleetworkspace

Published 2026-06-30 · Updated 2026-06-30 · CVE-2026-44949

Positive Technologies (AI Summary)

CVSS v4.0

7.0

High

Base vector

AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Rancher FleetWorkspace versions 0.7.0 through 0.7.10 Rancher FleetWorkspace versions 0.8.0 through 0.8.7 Rancher FleetWorkspace versions 0.9.0 through 0.9.6 Rancher FleetWorkspace versions 0.10.0 through 0.10.7

Description A flaw in the admission path of the Rancher webhook handler allows side effects to occur. An unauthenticated attacker with network access to the in-cluster rancher-webhook service can submit a crafted admission payload to create workspace-related Kubernetes objects using identity data chosen by the attacker.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Missing Authentication

Weakness Enumeration

CWE-306

Related Identifiers

CVE-2026-44949

Affected Products

Fleetworkspace

References · 3

• https://github.com/rancher/webhook/security/advisories/GHSA-h83p-cq95-vph4 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-44949 · Security Note
• https://twitter.com/VulmonFeeds/status/2071986687257858358 · Twitter Post